To take full advantage of the power and promise of the SRAM Force groupset, you need a cassette and chain that are up to the task. With the new SRAM PG1070 10-speed Cassette"s semi-spidered design, you"ll get the high level of shifting performance that SRAM is known for, but with an improved and much quieter cassette/chain combination. PowerGlide technology uses varying tooth profiles to give you smooth, precise and quiet shifting action Semi-spidered construction is lightweight, strong and efficient Heat treated steel cogs increase life Resilient forged 7000 aluminum lockring