Canine Equipment Ultimate 1-Inch Martingale Dog Collar, Large 16 to 22-Inch, Checkerboard Clean correction and an audible sound when used as a training collar It can prevent dogs from backing out of collars and has limited slip action to prevent over correction and choking Made from tubular webbing that is extra soft with no exposed edges Fully adjustable collar features a stainless steel D-ring Collar is 1 inch wide that adjusts to fit necks 16 to 22-inch