Our Guardian Gear Classic Nylon Collars are made of high-quality nylon that is durable and practical. Adjustable Nylon Collars come in four widths. Quick-release plastic buckles and nickel-plated D-rings.. Bar-tacked stitching at stress points provides extra strength. Plastic contoured quick-release buckles. Nickel-plated D-rings. Material - Tough nylon with a nickel-plated swivel clip. Size - 3/20cm . Collar fits neck 15cm - 25cm .. Colour - Black.