Prozap, 10', Bovi-Rub Back Rubber, Designed For Effective & Economical Control Of Flies, Grubs, Lice & Ticks On Cattle & Other Livestock, Superior Insecticide Charging With Wicking Action, Allows For Low Stress Application Of Insecticides On Cattle & Other Livestock, Hang Near Water, Mineral Feeders Or In Alley Ways To Encourage Use, Initially Charge With 2.5 To 5 Gallons Of Solution & Recharge As Necessary To Maintain Wetness.