Our Martingale Dog Collars with Chains combine the convenience of an adjustable collar with added safety and control of a choke style collar. Martingale Dog Collars give the convenience of adjustable sizing with the safety of a limited range of choke collar action. Limited closure helps to prevent injury to pets. Sizes: Small (5/8" Wide) Fits Necks 13 inch to 18 inch Medium (3/4" Wide) Fits Necks 16 inch to 24 inch Large (1" Wide) Fits Necks 22 inch to 34 inch Choose from Black, Blue, Bluebird, Raspberry, Red, or Ultra Violet. Additional Details ------------------------------ Product description: Our Martingale Dog Collars with Chains combine the convenience of an adjustable collar with added safety and control of a choke style collar. Martingale Dog Collars give the convenience of adjustable sizing with the safety of a limited range of choke collar action. Limited closure helps to prevent injury to pets. Sizes: Small (5/8" Wide) Fits Necks 13 inch to 18 inch Medium (3/4" Wide) Fits Necks 16 inch to 24 inch Large (1" Wide) Fits Necks 22 inch to 34 inch Choose from Black, Blue, Bluebird, Raspberry, Red, or Ultra Violet.