This is a set including a training bat for practicing an inside-out swing and 14 core-filled sponge balls that can be used indoors. I am selling this because my child is graduating from youth baseball. The sponge balls make a "crack" sound when hit properly, allowing you to confirm contact. The ability to practice easily at home was also appealing. Please understand that this is a used item. - Color: Red - Included: 14 yellow training balls - Purpose: Training bat - Size: 6 (for ages 12 and under) Thank you for looking.