Double-End Speed Ball - 19 cm Train like Roy Jones Jr! The fastest boxer of all time likes to train with a double-end speed ball. Improve your strike technique, stamina and reflexes with the double-end speed ball GR-D 8. The air-filled ball is a punching ball hung on two rubber cords. Thanks to the cords, the ball flies backward after being punched and then rebounds in the direction of the boxer. The power of the punch and the tension of the rubber cords will affect the force of the rebound. For this reason, the double-end speed ball is perfect not just for advanced boxers at the boxing gym, but also for beginners and home users. Get the most from your workout or strength training with the boxing equipment from Gymrex, which stands for high quality. Bag diameter of 19 cm Resilient and low-maintenance imitation leather Long-lasting rubber cords, high-quality latex balloon Train to improve a variety of skills such as reflexes, stamina and technique Incl. mounting accessories and air pump with two needles