Sram pg1050 10 speed road cassetteif youre a rider who demands performance the pg1050 is your only choice for light weight strength and precise shifting featurestechnology powerglide wifli weight 11 23t 250g lock ring material black spider lock ring and spacers cogs nickel plated cogs other options 11 28 11 26 11 25 11 23t buy sram components from chain reaction cycles the worlds largest online bike store