Made with 100% top-grade genuine leather. Each ball is individually shaped and balanced for rebound accuracy. Great workout ball for any home gymor professional gym. Triple reinforced seams, Lace-up for easy bladder removal, lined for durability, reinforced loop, and welted seams.Lightweight design means lightning-fast rebounds. Working out with a speedbag increases your shoulder and arm endurance, hand-eye coordination, timing, punching speed, and power. Speed bags are used in MMA, kickboxing, boxing, Muay Thai, and other combat sports. The bladder should not be overfilled. The latex Bladder needs to be inflated regularly.From beginners to intermediate users and advanced users we have a bag available for you. The smaller the bag the faster the rebound, and the quicker the reflexes.