The high performance Shimano Deore XT M771 10 speed cassette features a light weight alloy carrier to mount the 6 largest sprockets, with most sprockets cut away and drilled to reduce weight without reducing rigidity. The chrome-plated cassette and lockring finish looks good and provides hard wearing resistance to corrosion. Designed specifically for use with Shimano's Dyna-Sys 10 speed standard, the close ratio gearing increases efficiency by allowing the rider finer cadence control, whilst the computer designed Hyperglide sprockets run extremely quietly when paired with a HG-X chain and feature contoured shift gates for crisp, smooth shifting even under load.Weight: 323g