Prozap, 22 count, bovi-strips, face flaps are designed for use with the bovi-rub, for effective & economical control of face flies, horn flies, lice & ticks on cattle & other livestock, simply tie the bovi-strips to the bovi-rub for additional insecticide application to the face & sides of cattle & other livestock, superior wicking action allows for low stress application of insecticides, box.