The quick snap bungee replacment strap fits the ET 300 E Collar system. They come in many colors and are made out of biothane which means no smell, no stain. It also keeps a reliable fit while working your dog with the bungee and allows you to fit your dog once with the quick clip. These collar straps are amazing and I reccomend them to everyone. If you want a strap for "The Boss" aka ET 800 E Collar just let me know in the comments section as they are the same price.
Collar Strap Colors