E Collar Compatible Models 300,400,900 Barkless BL-100 - 3/4 Inch Biothane+CPE Collar Small Receiver Models 300, 400,900, and Barkless BL-100 - 3/4 Inch Biothane Buckle Strap & Short Contact Points Kit- Orange Strap High Quality 3/4" Buckle Collar using...