Our Dog collars are made with Quality in mind. They feature a tubular rivet and stitching for durability. Nickel plated hardware and we only use Authentic BioThane® webbing from authorized distributors. We offer two sizes both with 1" wide webbing. Medium Fits 14"-18" neck and Large 18"-22" neck. Measurement is based off actual circumference of the dogs neck. Type of BioThane® webbing used on these collars is BETA 520 Standard.