Dog owners who use training collars, these rubber tips are an absolute must-have for keeping your pup comfortable and protected! You get 30 pieces total with three different sizes - 14 of the 13mm length, 10 of the 16mm, and 6 of the 20mm length, all with a 6mm inner diameter to fit most standard training collar contact points. Made from soft, conductive silicone material that's durable and has smooth edges so it won't irritate your dog's skin or damage their fur. The conductive property means your training collar still works perfectly while providing that crucial protective barrier. Perfect for shock collars, bark collars, prong collars - basically any training collar where metal contacts touch your dog's neck. Installation is super simple - just slide the silicone sleeve over the metal tip and make sure it's snug against the contact point with no gaps. The different lengths let you choose the right coverage based on your dog's hair length and collar type. Having 30 pieces means you've got plenty for multiple collars and replacements when needed. Seriously, if you use any type of electronic training collar, these rubber tips make a huge difference in your dog's comfort while maintaining the training effectiveness. It's one of those small accessories that shows you care about your dog's wellbeing during training sessions.