​Up to twelve balls can be pre-loaded in the Team Trainer, and up to five balls can be pre-loaded in the Individual Trainer. The rail accommodates eleven or four balls plus one which is loaded for hitting. Additional balls should not be loaded into the hopper when the rail is full. The hopper should be used only for funneling balls onto the rail. *PLEASE NOTE! ALL BALLS MUST BE FED INTO THE HOPPER ONE AT A TIME. When two or more people are training on the AcuSpike, it is very easy to load balls into the hopper simultaneously as others are hitting, so the rail never becomes empty.