Contrac All-Weather Blox kills rats and mice.  Norway rats, roof rats, and house mice may consume a lethal dose in one nights feeding with first dead rodents appearing four to five days after feeding begins.  The blox are individual one ounce pieces with a hole drilled through the center for ease of installation in the bait station.  Simply thread the one ounce pieces onto the wire inside the tamper proof rat box (3 or 4 recommended) or place one into the tamper proof mouse bait container.  There are approximately 16 blox in the 1 lb. City Pack, 60 blox in the 4 lb. bucket or 270 blox in the 18 lb. bucket.  May be used in the Protecta EVO Ambush, JT Eaton Strongbox or the Aeigis Mouse Bait Station.