SKLZ Foam Training Baseballs are ideal for players of all ages and skill levels to safely practice hitting and fielding. Soft and safe, the 100 percent foam construction ensures that players won't get hurt on contact with the ball. Officially sized, foam balls provide instant feedback, for easy and safe training. Each pack of six includes two balls in three different colors for use in a variety of exercises. SKLZ Foam Training Baseballs can be used indoors or outdoors..