The MASH Differential Training Baseballs provide different inputs to the player, forcing them to adapt their training to accommodate the variances experienced across the training implements. The research-backed improvement in motor skill retention and transfer allow these baseballs to improve player performance when integrated into a monitored training program.
 
Each set consists of three sets of three baseballs, totaling nine baseballs in the set. There are three 4-ounce balls, three 5-ounce balls, and three 6-ounce balls. Each of the weights also has three different circumference baseballs -- one is regulation size, then one is smaller than regulation and one is larger than regulation size.
 
This set of baseballs was developed by MASH training staff to be paired with the MASH training principles to help MASH athletes reach their potential. Using these outside of the MASH training regimen is not recommended, as improper application of the training implement can have detrimental effects.