Sambboho martingale beaded dog collar collection. Designed to help you take back control of your walks. Escape proof to provide peace of mind without hurting. Safe and comfortable. Will tighten only when dog is pulling. Stainless steel chain to prevent allergy and chaffing. ALL EXISTING DOG COLLAR DESIGNS CAN BE MADE as a martingale as made to order. Email sales@sambboho.com for this request if you don't already see the one you want in the current martingale selection. No extra cost.