Extra durable, tough and resilient butyl rubber replacement bladders are specifically manufactured for the 2-N-1 Double End Bag that we offer. Built for super speed, precision rebounds and intense professional training. Each 2-N-1 Double End Bag has two bladders, one on top and one on bottom. Always keep a spare or two around for emergencies!

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.