Modified C-hubs with holes for mounting graphite human body upstop with height adjustable place to manage the moment your body details the graphite prevents. The C-hubs function big openings for faster & easier assembly/disassembly of ECS. The complete ECS installation can be easily inserted/removed through the C-hub without necessity for disassembly. The big areas prevent collision of ECS with C-hub in serious crashes. Caster pre-set at 4. Medium rigidity for carpeting competition. Use with matching left-side C-hub #302364-M.