The Box Three Prime 9 cassette is a great all-around cassette option. All cogs are stamped from steel and subsequently, the larger ones are pinned to alloy spiders. It also features weight-reducing holes on the cogs.Rated for eBike useThe Box Three Prime 9 offers ultra-wide ratio with consistent progressionsPrime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift throughFewer parts, reduced weight, and increased durabilityCogs pinned to lightweight spidersConstructed using a standard freehub body (HG)Item SpecificationsCassette Body TypeShimano HGCogs12-14-16-18-22-28-34-42-50ColorBlackDefined ColorBlackDesigned for ebikeYesDrivetrain Speeds9Range12-50 BOX Three Prime 9 Cassette 9-Speed Cassettes UPC: 616043832852