A. The material of the ball and bat is ABS, which is considered safe and non-toxic. Playing the catch game can be beneficial for your body and helps develop hand-eye coordination skills. It's also a good type of game for building a positive relationship between parents and children. The back strap is adjustable. B. The ball and bat are made of ABS and are generally safe and non-toxic. Children can play with them to potentially develop hand-eye coordination skills. Playing is a good way to establish a good relationship between parents and children. C. Colour: Red + green; Material: Plastic + nylon; Size: Sticky diameter about 18 cm, hard ball diameter about 6.5 cm D. Package Contents: 1*Ball, 2*Bats. Only the above package content is included, and other products are not part of it. Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement error is approximately +/- 1 - 3 cm.