Prozap, 22 Count, Bovi-Strips, Face Flaps Are Designed For Use With The Bovi-Rub, For Effective & Economical Control OfFace 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.