SRAM DUB BSA Bottom Bracket Threaded. Includes 4.5mm and 9mm Spacer which is the standard spacer setup for 73mm shell MTB Super Boost + bikes. Spacers are not super important if you already have some on your current BB, they can be re-used. They key is keeping you bb bearings smooth. The bottoms bracket cups are compatible with so many bikes, road, gravel, and MTB. Combined shipping is welcome. Buy here and save a ton. These sell for $25 at the major online retailers.