Description：
The key to the design—and its challenge as a multi-athlete training tool—is the uneven distribution of weight. The Worm features a 12" (30.5CM) diameter cylinder with an exterior shell and internal fillers of varying sizes. There are 100LB filler bags, 70LB filler bags, and additional 6LB separator bags.we sell them with filling or empty,you can choose suitable things to adjust the weights as your required!