Champion Sports Volleyball Trainer Size 8 - 7" - 8 - Rubber, Nylon - Yellow - 24 / Case Traditional-size, 18-panel volleyball is 20 percent lighter than a normal ball for a comfortable way to train young learners. Hand-sewn, vinyl-covered nylon over a tough rubber bladder offers excellent air retention. Bright color is easy to see and stands out during use. Volleyball trainer is perfect for working on accuracy, bumps and sets.