Strengthen key muscles that contribute to a powerful swing at the plate while increasing the longevity of your bat with the Varo(R) RAP(TM) 4 oz. Hittable Training Bat Sleeve. Designed with a combination of proprietary ballistic infused material with taper and barrel weights, this sleeve is an all-purpose trainer that provides realistic ball flight as you make contact with each pitch. Bolster Your Swing: Live Hitting: Adds four ounces to the bat when hitting to optimize the moment of inertia and increase swing power Superior Bat Protection: Proprietary ballistic infused material offers excellent coverage to protect the surface of your bat Vibration Dampening: Absorbs impact to minimize sting without compromising ball flight Balanced Weight Distribution: Disperses weight over the taper and barrel to maintain a game-like feel True-Fit Technology: Flexible cuff features an infused grip to ensure a secure fit Additional Details: Weight: 4 oz. One size fits most bats Recommended for ages 8+