For fixed, adjustable, sliding combs and piston-type recoiling stocks. Absorbs shock. Soft vinyl pad attaches to gunstock by non-damaging fasteners of velcro. Spacers are secured by repeatable self-adhesive. Performs hundreds of changes when kept clean. Variable position of spacers controls width of comb and cast and height of 1/16", 1/8", 3/16", 1/4", 5/16" and 3/8".