FINAL All-Weather BLOX contains the powerful active ingredient, Brodifacoum, our strongest, single-feeding anticoagulant. FINAL is effective in controlling both rats and mice but works especially well to clean out persistent mouse infestations. FINAL All-Weather BLOX, with its distinctive cog-like shape, is made with more food-grade, inert ingredients for a flavor rats and mice can't resist. The bait of choice in the pest control industry, Bell's patented All-Weather BLOX are manufactured from Bell's unique extrusion process that yields a hard, multiple-edged bait with the palatability of a meal bait and the weatherability of a paraffinized bait.