GoGo Adjustable Martingale Collars 3/8" wide and adjusts to 10" - 12" Excellent for training and designed for gentle control; a safer alternative than a choke collar Specially crafted metal hardware designed for a quick, smooth release Heavy-duty, durable YKK plastic buckle - for easy on and off - no uncomfortable tugging and twisting Made from high-quality nylon; Lifetime Manufacturer Warranty