Contrac Blox is a single-feed bait rodent bait (Bromadilone) that is weather resistant. Contrac Blox is an excellent clean-out and maintenance bait to control mice and rats, including warfarin-resistant Norway rats. California has placed Contrac Blox in a restricted use category. We can not ship Contrac to California. Other single-feed baits with bromethalin (non-anticoagulants), such as Gladiator, Top Gun, Fastrac, and Terad3, are available in all states.