The Ultimate Leash Martingale Collar, Fashion Series, Red Color It's like having Power Steering on your Dog. Heavy woven 1" Nylon webbing Martingale collar. This collar can be adjusted before you put it on your dog. Martingale collars are available in 3 adjustable sizes ranging from 14"-36. Heavy Duty Nickel Plated Metal Side Release Buckle, Slides, Loop and martingale chain.