Synovex Implant Guns & Needles For use with Synovex Implants. SX10 Implant Gun: Exclusive patented retracting needle Simple bolt-action process Automatic dose advance and dose counter Automatic last-dose stop Designed for maximum operator comfort and convenience Built tough for a lifetime of service A five-pack of replacement needles also available (sold separately). The Revolver Implant Gun: Metal construction for durability and dependability Multiple-dose for fast, convenient implanting Lightweight and maneuverable for easy use Adjustable cylinder angle accommodates your personal implanting style comes with 2 needles A six-pack of replacement needles also available (sold separately).