CNC machining
Extremely light aluminum 6061
 Lasered XON logo and closing sense
For SHIMANO and SRAM pinion cassettes, both Mtb and Stradaper 11-tooth pinions.
CNC Lock Ring for Cassette
 Material: 6061 Alloy T6 
 XSS-59S for Shimano-Sram 11T Cassettes