soft baseballs are made up of PU foam, So these balls are safe for beginner and 't cause injuries or bruises. In addition, beginner will have more when they practice throwing, hitting and throwing. These foam baseball balls are made of quality and PU, which has the characteristics of softness, stability and good elasticity, allow to pop right back into their original shape after they're hit. The spong baseballs are soft and lightweight, safe and odorless, flexible and elastic. foam baseball can not only be used as a practice baseball, also can be used as a decompression toy to release stress and relieve anxiety. Soft Training Baseballs work perfectly with baseball pitching machine.The lightweight baseballs are safe for all ages to play with, although practicing indoors, it will not cause damage to furniture and floors. These safety baseballs are a great gift . Baseball are practical and can be given to your family, even , as birthday gifts, Christmas gifts, gifts, any , etc. Make a great toy gift or party favor for and grils Color: yellow : PU size: 4CM Package Contents: 12 x stress ball Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.