A FORCE in the double end bag game is the new FIGHTING Force Leather Double End Bag. With all leather construction and piped seams, this bag is design to go more rounds. A traditional rubber air filled bladder for maximum reaction. Work hand speed and head movement and become a FORCE to be reckoned with. 

You MUST moisten the needle before inserting it in the bladder (Petroleum Jelly is best.) This will help prevent small tears in the inflation valve and deflation of your bag.