WePet Stainless Steel Nylon Chain Martingale Collar Comfort Heavy Duty Large Dog Collar Escape Perfect for Training Walking Running and High Activities 250lb Pull Proved (Large, Bl

[SIZING]: Adjustable Collar Neck size with Length（18"-21.6"）, Width: 1" Inch. [UNIQUELY DESIGNE]: Recommended by professional trainers, the Martingale Collar designed to make training with your dog safe and effective. Tightens under tension but only tightens enough to provide a (subtle) controlled training cue to your dog. [PREMIUM QUALITY]: Imported high quality Nylon, built with extra strong tensile strength for long lasting. Dog chew proof-ness are 5 times than any normal polyester or cotton fibres. [DURABLE CONSTRUCTION]: The WePet Martingale Collar is constructed with premium quality nylon and 304 High Strength Stainless-steel provides the perfect balance of durability, functionality, and aesthetic appeal. [HOW TO USE]: Once you receive your collar, open the collar wide by adjusting the metal slide. Slip it over your dog's neck and decrease size until you can comfortably slip only a couple of fingers under the collar.The unique limited closure prevents the choke from becoming too tight.