microSHIFT H07 Cassette - 7-Speed 12-40t Standard HG ED Black FinishmicroSHIFT's H07 Series cassettes are designed to deliver maximum durability. With all steel construction and multi stage heat treatment these cassettes will stand up to whatever you can throw at them whether its high torque E bike usage or just good old fashioned mashingContinuously molded cogs are straighter than stamped steel resulting in more consistent predictable shifting performance Precision ramps and chamfers for rapid chain movement