The sram pg950 9 speed cassette this fantastic 9 speed cassette has been tested on the pro circuit and proven on the podium so you can rest assured you39re investing in a quality product with its heat treated steel and chrome plated sprockets this is an incredibly durable cassette with an impressive strength to weight ratio what39s more this bike cassette benefits from sram39s superb powerglide ii a cassette technology which offers more reliable incr