"Rear Shooting Bag - Filled Description These innovative, high-quality leather and polyester Front and Rear Shooting Bags function with most brands of front rests. The exclusive hook and loop tabs on the Front Rests allow quick installation and removal from the cradle without time-consuming need to lace them on. The leather gives you a secure rest and the polyester, which will not stretch or sag, allows the bag to hold its shape. This combination makes for the best shooting bag on the market. Standard Rear: for use with the 4"" Center Post on the Rock and other similar rests. "