The RES foam 5150 / 5153 Series bump stops come with a .500" or .625" ID and a 2" OD and are offered in heights of 1/4", 1/2", 3/4", 1" and 1.5" to meet most packaging needs. With these foam stops, the first ~50% of travel is fairly linear, before turning progressive after that point. Offered in four densities - SOFT (RED), MED (WHITE), HARD (BLUE) and X HARD (BLACK) and color coded for easy reference. When running multiple stops, a divider washer should be used to separate the stops to maintain consistency. Choose density