Both the FS2 and FX2 have the single system composite design for increased bat control. Unlike the FS1 and FX2 which are two piece bats. The FS2 and FX2 also have IMX Composite Barrels that optimizes the sweet spot for maximum performance. The main difference is the FX2 is an end loaded bat with a larger sweet spot. The FS2 is a more balanced bat. Both models have an Ultra-thin handle with performance diamond grip.