The Revalor Implant Gun is the exclusive applicator gun for Revalor Implants. Directions for Use: The implant is placed under the skin on the posterior aspect of the ear by means of Revalor Implant Tool. Always use a sharp needle, as needles become dull, they may tear tissue and make proper implanting difficult. After implanting, wipe the needle with cotton or gauze moistened with alcohol or other suitable disinfectant. Do not dip needle in solution or needle may become plugged. Replace needle when dull. Revalor Implant Tool Purple Highlights: Manufacturer: Merck Animal Health Comes with 5 needles Additional needles also sold separately Works with Revalor S, IS, H, IH, G, 200, and XS cattle implants