This martingale dog collar provide the convenience of adjustable sizing with the safety of a limited range of choke collar action This martingale dog collar 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. The small sized 3/4-inch wide collar is fit for 16-24-inch neck. Available in red color.