Prozap Bovi-Rub Back Rubber is designed for effective and economical control of flies, grubs, lice, and ticks on cattle and other livestock. Superior insecticide charging with wicking action allows for low-stress application of insecticides on cattle and other livestock. Hang the back rubber near water, mineral feeders, or in alleyways to encourage use. Initially, charge the fly control back rubber with 2.5 to 5 gal. of solution and recharge as necessary to maintain wetness; use Prozap insecticides for optimal results.