Designed exclusively for electronic training devices, the Bungee Collar helps maintain consistent contact between the receiver and your dog's neck during training sessions. The integrated bungee section allows for slight movement while helping keep the receiver comfortably in place. To install, simply unscrew the logo-debossed end, slide your electronic training device onto the collar, and secure the screws once in place. As BioThane® is slightly thicker than standard straps, a small amount of vaseline is recommended to aid smooth installation. Made in Maxi width only. This collar is intended for use with electronic training devices only and is not suitable for leash attachment. As with all training tools, dogs should be supervised while wearing the collar and should never be left unattended. This listing is for the collar only. Electronic training device not included.