This Combo Collar Combines The Safety Of A Collar With The Control Of A Choke. This Unique Martingale Design Using Both Sturdy Chain And Nylon Materials Creates Even Pressure The Entire Circumference When Tightened. The Collar Allows You To Prevent Your Dog From Slipping The Collar When Startled Or During Training. When The Choke Feature Is Not Used, The Collar Acts Like A Loose Collar. Tags Can Be Attached Without Interference Of The Chocking Action. Size Adj 3/8 X 10 -15 Red