Our Guardian Gear Martingale Collars provide the convenience of adjustable sizing with the safety of a limited range of choke collar action. Collar size adjusts as pressure is applied to the leash Limited closure guarantees that the collar will not injure pets Each Guardian Gear Martingale Collar comes with a hangtag for easy retail display. Available in basic Black Red and Blue sizes. Coordinating chain link leads (item ZA6564) are also available. Items may be combined for quantity discounts. See the Specifications and Sizing Info tabs for more product details.