1.Features a Unique Quick-Click Buckle on the Training Collar for convenient On and Off Access and added Safety2.The Tutor-Shield Dog Collar is designed to Train from both Barking and Biting3.Connects to any and all Dog Leashes4.Features a High-Grade and Thick and Durable Chain with Reinforced Webbed Interlock Stitching around the Nylon Collar5.Available in Multiple Sizes and ColorsThe Pet Life 'Tutor-Sheild' Martingale Safety and Training Adjustable Chain Dog Collar is composed of Durable Nylon with a Metal matingale chain designed specifically for training and behavioral correction such as biting or barking. The Nylon collar features interlock weaved stitching for further added durability. The collar features Quick-Click connecting buckles for easy on and off access. Sizing Guide (INCHES)COLLAR DIMENSIONS: LARGE: WIDTH: 0.98" NECK GIRTH: 15.74" - 20.47" (Less than 99 LBS)