Martingale Dog Collar - Charcoal - Medium The webbing is made of soft and smooth nylon Limited restriction on a dog's neck, combining the safety of non-slip collars and the comfort of non-choke ones 4 sizes to best fit your dog Size Regular Mode: 34 to 53 cm / 13.8 to 21.2 inches - Size Training Mode: 24 to 43 cm / 9.9 to 17.4 inches 19 beautiful bright colors to choose from