The TITLE Gyro Balanced Punching Bag is designed for maximum performance and efficiency during training. Thanks to its precise Gyro Balanced manufacturing, it ensures true rebounds and rapid recoiling, helping to develop lightning-fast reflexes, improve speed, and enhance hand-eye coordination. The ball features a top-grade leather shell with triple-reinforced seams and lacing, making it perfect for intense workouts. It includes a butyl rubber pro bladder with special internal balancing for maximum results. Important: Before inserting the needle into the bladder, it must be moistened (Petroleum Jelly is best), which helps prevent small tears in the inflation valve and air loss from the ball. Size chart: Size Width Height S 13 cm 20 cm M 15 cm 23 cm L 18 cm 26 cm