The Avid DNA Identification System features a single use disposable needle assembly for rapid, error free animal identification. The disposable needle assembly fits securely on the injector pistol and comes preloaded with a sterile 12.5mm microchip. The Avid DNA Identification System is designed to be used with the injector pistol (AVID3003 - sold seperately); the injector pistol provides a quick, sterile injection of the microchip transponder. The Avid DNA Identification System is ideal for environments where microchip implant protocols require minimal handling while assuring sterility of the microchip transponder.