These are both high quality 1″ recoil pads. The Decelerator is a 1″ medium density rubber pad made by Pachmyer. It has no open side vents and is made of a rubber material specifically designed to reduce felt recoil. The Limbsaver is a 1″ softer density rubber material made by Sims Vibration Labs. It has internal sealed air chambers designed to compress more and further reduce felt recoil. Because of the softer rubber it is more difficult to grind to a fine finish than some other pads and the hole spacing will not allow it to be used on our adjustable butt systems. We feel that these are two of the best recoil pads available and are fine options for our stocks.