AIM-L VetCaps designed for use the VetGun Insecticide Delivery System. These softshell capsules disperse insecticide on impact to control horn flies, face flies and lice. Leaves a bright color mark to let you know you've made contact. Recommended for use in cattle over 600 lbs, it only takes one VetCap to treat each animal for four weeks. Re-apply as needed but not more than every two weeks or more than four times in a six-month period. Ideal for treating cattle on pastures or where working facilities are not available. The VetGun system is designed to be easily used by one person and save time, money and labor.