Clinical research shows conclusively that warming up with a heavy device in the on-deck circle prior to an at-bat will slow you down at the plate! While you may FEEL quicker, studies using computer-aided timers of various warm-up tools (heavy donuts, batting sleeves, extra-heavy bats, etc.) show that players are actually SLOWER using these tools! Why? 

Because swinging heavy devices prior to an at-bat actually fatigue and tire out the 
fast-twitch muscles fibers you'll be using momentarily at the plate!

        The solution? A tool that is heavy enough to warm you up while not slowing you down. Perform at your best with a 4 ounce on deck batting donut! Fits on any bat with a barrel diameter greater than 2 1/2 inches, which includes most baseball bats, high school and above. Made of unbreakable Lexan. Will last for many years of play!

On-Deck Batting Donut $11.99 + $5.00 s/h

Bat Speed Package Discount SAVE 10% 4 oz. On-Deck Donut + Bat Speed Booklet $33.25 + $8.00 s/h