MAXSTRENGTH Double End Floor to Ceiling Speed Ball, Made From High Quality Rex Leather. This is an inflated ball situated between two ropes or cords (one attached to the ceiling, one to the floor) and used to develop hand/eye coordination and balance. This bag also provides a moving target, which enhances. You can box the bag like an actual opponent, throwing crisp combinations, reacting to the bag's movement by slipping/blocking/"parrying" and then dancing around the bag, steadying it with a jab before launching another combination.