Replacement 1 inch collar straps for some models of SportDOG Brand® training e-collars such as the Contain + Train™ collar or TEK Series collars. Perfect for replacing old collar straps or differentiating each dog's collar. Simply remove the receiver unit from your dog's current collar and place it on the new strap. These straps do not feature a D-ring for leash attachment as leashes should not be attached to e-collars due to the uncomfortable pressure it causes from the probes on your dog’s neck. They do feature a metal strap keeper to help keep any excess strap flat against the collar.