Made of extra heavy canvas, the shell of this conditioning bag measures 10" across, big enough to fit most peopleâ€™s hands. When filled with steel shots, this bag can weight up to 15 lbs. Develop your open hand techniques by strengthening and toughening your fingers, palm and back of hand. Train with the iron palm bag and your leather punching bag will feel like feathers! Can be Filled with dried rice, beans, sand or BB's. Comes Unfilled.