For use on a mechanical rest. Has narrow hollow center to accommodate most hunting rifles. Bag size: 2 1/4" W x 5 3/4" L x 1" H (in the center), and approximately 1 1/2" to 1 3/4" from ear to ear in the center. Note: Bags are not filled with sand when purchased and will need to be filled by customer. Made in U.S.A. 100%.