By integrating the XD driver into the cassette itself, we were able to eliminate approximately 12mm of unused space between the cassette and the hub flange, creating a near-dishless wheel that's stronger than competitor wheelsets by a longshot.Offering 233% range and at only 180g, this cassette is a factory replacement for all LG1 wheelsets that have the integrated 7 speed cassette. The 21t cogs is made of aluminium, while the last 6 cogs are machined from a single piece of steel.Our industry exclusive 9t cog allows for more range without just making the biggest cog bigger. It also means you can run a smaller chainring than with competitor cassettes, allowing for greater ground clearance. *Note: Our 7 Speed Cassette works with 10 and 11 speed chains from both Shimano and SRAM. What's in the box: Cassette and grease packet Note: this cassette only works with e*thirteen LG1 wheelsets. SPECS Material: EXA+ Alloy and Heat-Treated Cromoly SteelDrivetrain: 1 X 7spCog Sizes: 11sp 9-10-12-14-16-18-21Features: The only way to eliminate the typically unused space between the cassette and the hub flange was to combine the freehub and the cassette into one piece. The 21t gear of the cassette is aluminum and contains the freehub, while the last 6 cogs machined from a single steel piece.Colours: BlackWeight: 180g