12oz. Original ProCut™ Strap-On Model Swing Weights $29.95 + $5.00 Shipping and Handling Strap-On Counter Weight For beginners to 12 yrs. old - We recommend using this model in practice swing drills (on -deck), so the younger hitters really feel the hands whip the head of the bat through the strike-zone. Once hitters are use to the weight, they can use it in all their hitting drills. Advanced Players 13 yrs. old to Pro - This weight is great in tee work but we use it mostly in side-toss drills. Such as inside, middle, to outside pitches (high or low), off-speed side-toss, Call high or low ball (2 ball drill), rapid fire, call the number on the ball and even batting practice. You can use any of our heavy hitting balls with this weight. Item # 65L77A