Overload / Underload training at 20% weight variants has been a historically proven method of training to enhance overall bat speed for since Dr. Coope DeRenne first analyzed it's effects in the 1990's.  Atlet Overload / Underload wood bats powered by Baker Bats are designed to enhance overall bat speed a much more affordabe cost to the athlete than rival speed trainers on the market.
 
Includes:
One 20% Overload Maple Pro Cut Wood Bat 
One 20% Underload Mape Pro Cut Wood Bat
 
Choose the Same Bat Length as your Game Bat
Not Intended for Machine Use or In-Game Use