Contrac All-Weather Blox City Packs are a single-feedinganticoagulant rodenticide containing the active ingredient,Bromadiolone. Contrac All-Weather Bloxs' are specially formulatedwith an optimal blend of food-grade ingredients and a small amountof paraffin. Time tested rodent acceptance and control due to itshighly palatable formulation, Contrac All-Weather Blox is anexcellent clean-out and maintenance bait to control commensal andnon-commensal rodent species including warfarin-resistant Norwayrats, meadow voles and Peromyscus.

Each blox weighs 28 grams and will work with mosttamper-resistant bait stations, in tight places, or can be nailedto ceilings or rafters.

Each case contains 16 x 1 lb pouches. Total 16 pouches.


Size 16 x 1# BAGS / CASE
Manufacturer BELL LABS [view products, website]
Dimensions 1" Long x 1" Wide x 2" Long
EPA# 12455-79
Active Ingredient Bromadiolone 0.005%
Label belcb1616_contrac_blox_label_06052019.pdf
SDS belcb1616_contrac_blox_sds_06052019.pdf
Chemical Classes Anticoagulant
Target Pests House Mice Norway Rats Roof Rats
Size 1" Long x 1" Wide x 2" Long
Use Residential, commercial, or industrial buildings, indoors and outdoors. For use in tamper-resistant bait stations
Application All rodenticide baits should be placed in a Bell Labs tamper-resistant bait station.
Pet Safe Yes, when used as directed. Follow all label instructions and heed all warnings. For complete protection of non target animals and children, use tamper resistant bait stations.
Formulation Professional Product
Coverage Area All bait placements must be inside or within 50 feet of buildings.
Yield Each Blox weighs 28 grams Each 4 lb. pail contains approx. 64 blox Each 18 lb. bucket contains approx. 288 bloxs
Color Blue Blox
Material/Construction Extruded Bait Blox
Special Features Highly palatable, yet weatherable, CONTRAC works well in wet and dry conditions. A hole in the center of the Blox lets technicians place it on bait securing rods in tamper-resistant bait stations, or nail or wire the Blox in place.


  • Highly palatable, yet weatherable, ContracAll-Weather Blox works well in wet and dry conditions.
  • Multiple edges that appeal to a rodent's desire to gnaw.
  • Bait shyness is not a problem with Contrac All-Weather Blox because mortality occurs a few days after bait is consumed.
  • The antidote, Vitamin K1, is readily available.


It is a violation of Federal law to use this product in a manner inconsistent with its labeling.

Read the entire label and follow all use directions and use precautions. Use only for sites, pests, and application methods described on the Product Label.

IMPORTANT: Do not expose children, pets, or non-target animals to rodenticides. To help to prevent exposure:

  1. - Store unused product out of reach of children and pets.
  2. - Apply bait in locations out of reach of children, pets, domestic animals and nontarget wildlife, or in tamper-resistant bait stations. These stations must be resistant to destruction by dogs and by children under six years of age, and must be used in a manner that prevents such children from reaching into bait compartments and obtaining bait. If bait can be shaken from bait stations when they are lifted, units must be secured or otherwise immobilized. Stronger bait stations are needed in areas open to hoofed livestock, raccoons, bears, or other potentially destructive animals, or in areas prone to vandalism.
  3. - Dispose of product container and unused, spoiled, or unconsumed bait as specified on this label.

- Bait stations are mandatory for outdoor, above-ground use. Tamper-resistant bait stations must be used wherever children, pets, non-target mammals, or birds may have access to the bait placement location.


- This product may only be used to control the following rodent pests in and around man-made structures: House mouse, Norway rat, Roof rat, Cotton mouse, Cotton rat, Deer mouse, Eastern harvest mouse* , Golden mouse*, Polynesian rat*, Meadow vole*, White-footed mouse, White-throated woodrat*, Southern plains woodrat*and Mexican woodrat*.

- This product must be used in and within 100 feet of man-made structures constructed in a manner so as to be vulnerable to commensal rodent invasions and/or to harboring or attracting rodent infestations. Examples of such structures include homes and other permanent or temporary residences, food processing facilities, industrial and commercial buildings, trash receptacles, agricultural and public buildings, transport vehicles (ships, trains, aircraft), docks and port or terminal buildings and related structures around and associated with these sites.

- Fence and perimeter baiting, beyond 100 feet from a structure as defined above, is prohibited.

- This product must not be applied directly to food or feed crops.

- Do not place near or inside ventilation duct openings. Do not contaminate water, food, feedstuffs, food or feed handling equipment, or milk or meat handling equipment or surfaces that come into direct contact with food. When used in USDA inspected facilities, this product must be applied in tamper-resistant bait stations.

- Do not broadcast bait. Do not use this product in sewers.

- Burrow baiting with Contrac All-Weather Blox is prohibited.


Determine areas where rats, mice, or meadow voles* will most likely find and consume the bait. Generally, these areas are along walls, by gnawed openings, in corners and concealed places, between floors and walls, or in locations where rats, mice, or meadow voles*, or their signs have been seen. Protect bait from rain and snow. Remove as much alternative food as possible.


RATS: Place 3 to 16 bait blocks (at intervals of 15 to 30 feet) per placement in infested areas. Maintain an uninterrupted supply of fresh bait for at least 10 days or until signs of rat activity cease.

MICE AND MEADOW VOLES*: Place 1 block per placement. Space placements at 8- to 12-foot intervals in infested areas. Two blocks may be needed at points of very high activity. Maintain an uninterrupted supply of fresh bait for at least 15 days or until signs of mouse or meadow vole* activity cease.

FOLLOW-UP: Replace contaminated or spoiled bait immediately. Wearing gloves, collect and dispose of all dead, exposed animals and leftover bait. To prevent reinfestation, limit sources of rodent food, water, and harborage as much as possible. If reinfestation does occur, repeat treatment. Where a continuous source of infestation is present, establish permanent bait stations and replenish as needed.

*Not permitted for use against the following species in California: Cotton rat, Eastern harvest mouse, Golden mouse, Polynesian rat, Meadow vole, White-throated woodrat, Southern plains woodrat, and Mexican woodrat.

Refer to the Product Label for a complete listing of rodents controlled, application methods and approved application sites.