This XG-1175 cassette is an integral part of the SRAM 1x� drivetrain system Full Pin� technology uses ten lightweight, stamped steel cogs and one 42t aluminum cog held together with 123 high-strength stainless steel pins Super wide 10-42t gear range - a perfect fit for any ride Optimized gear steps across entire range Open design aids in mud clearance For use with XD driver bodies 10-42t 11sp 10,12,14,16,18,21,24,28,32,36,42 Black