●【What is plyometric training? This training can be used to quickly release energy by rapidly stretching your muscles, allowing you to perform strong forces. Recommended as a warm up for your daily training or pre-game ●(Use the whole body to increase ball speed) You need to use the entire body to throw a heavy ball, and you can expect a better ball speed by throwing it with the entire body in mind of the upper and lower torsion differences ●(Stable Foam for Improved Control) The feel of throwing around the entire body allows you to achieve a stable throw, so you can aim to improve your control. Recommended not only for pitchers, but also for outfields who want to send a ball accurately ●(Can also be used for striking training) The plyo training ball will not blow off if you put force into the core immediately of impact, so you can expect to improve impact and meat power. To prevent injury, please limit the number of blows from a light ball ●Size: 2.9 inches (74 mm); Weight: 7.1 oz (200 g); Color: Blue; Material: PVC, iron sand