Therefore the BB shells as well as the eccentric BBs themselves are included. The shells are steel, I have no idea what grade though.
HOUSON Eccentric Bottom Bracket for Bicycle Bottom Brackets – Aluminum/Steel Cartridge Bearing for 68/73mm Frames (CNC Machined)
HEIBTENY Bike Bottom Bracket Conversion Set for 68 mm 73 mm Threaded Bottom Bracket Shells Eccentric Type for Track and Urban Bikes
ns eccentric Cromo 29/27.5 Boost 12x148 Large Frame
HOUSON bicycle bottom bracket, bicycle bottom bracket 68MM square BSA square bottom bracket housing bottom bracket axles for bicycle 122.5mm
HOUSON bicycle bottom bracket, bicycle bottom bracket 68MM square BSA square bottom bracket housing bottom bracket axles for bicycle 118mm
HOUSON bicycle bottom bracket, bicycle bottom bracket 68MM square BSA square bottom bracket housing bottom bracket axles for bicycle 127.5mm
