Excel "˜Modular"™ Hemi is a member of the Excel "˜Modular"™ family and therefore it includes a large number of components that are interchangeable within both the "˜Modular"™ family as the first generation G4 and G5. Besides the standard features that are available with the G5 Modular, the Hemi allows a single-leg amputee or single leg paralysis to be able to propel the chair using their working limb.