These are the copper crush sleeves that are used when clamping our inner internal throttle cable wire, or twist clutch cable inner wire, to the twist mechanism parts. We include one of these sleeves with every Twist Assembly (throttle or clutch) and we also include one with each cable (throttle or clutch). So in most new applications, you will have two sleeves to allow you a second chance to adjust length of cable if you don't get it right first time. But if you want or need some spares, they can be ordered right here.