Saddleback Leather Co. Tough Full Grain Leather Dog Collar for Neck and Walking Includes 100 Year Warranty Oddly thick vegetable tanned leather with reinforced stitching; Leather will soften with use. D-ring for leash attachment has riveted stopper for strength and stability 7 buckle holes spaced 3/4" each for maximum range of fit Crafted from 100% Full-Grain boot leather but thicker Dog Neck Sizing - Small Size: 12.5" neck Size, Medium Size: 16.5" neck size, Large Size: 21.5" neck size