This is EXO Design Yokomo Works 91 Conversion Kit w/ BBS Shocks, CNC Titanium Turnbuckle Set, BBS Spring Set Combo. One Chassis two layouts choose from. All carbon parts are made with 100% carbon fiber plate. Reenforced front and rear shock towers (3.5mm). For Big Bore shocks. Extra mounting positions on shock towers are available for fine tunings. Two aluminum battery holder nut and a carbon battery plate. The space can be adjusted freely according to the battery size. Two aluminum servo stands. Aluminum Servo Saver (Hex). (W91-001-B) WORKS 91 conversion kit. (EXO-006SPSET) 12mm BIG BORE SHOCK SPRING SET. (EXO-005SGD) UNIVERSAL 12mm BIG BORE SHOCKS SET. (W91-007TT) WORKS 91 CNC TITANIUM TURNBUCKLES SET.