Features: Material:Nylon with Soft padded Durable nylon with soft padded liner,comfortable and breathable to wear Hook & Loop design,adjustable,also you can put some patches,stickers High quality metal cobra buckle and D ring,strong enough,corrosion resistant and not easy to rust Quick control handle design,also can be fixed when not in use For the buckle,you can open it by press it's both sides up,when you lock it, just push it gently. Suitable for outdoor sports, training, travel, camping and hunting, durable dog training collar Fit for medium large and extra large dogs,e.g.Bull Terrier/Samoyed/Husky/Chow Chow/Bulldog/Pitbull/Labrador/German Shepherd/Rottweiler/Golden Retriever/Afghan Hound/German Doberman pinscher/Mastiff/Alaskan Malamute/Boxer/Rottweiler/Dalmatian/Saint Bernard/Old english sheep dog.etc. Package Include: 1 x Dog Tactical Collar Size Neck Adjustable Width M 38-47CM 4CM L 45-55CM 4CM XL 53-63CM 4CM