The Shimano HG81 10 speed mountain bike cassette out of the SLX series. Made for all Shimano 10-speed mountain bike groups.
The HG 81 SLX cassette uses Dyna-Sys technology. This means that the teeth are placed closer to each other, so during your shifts you need less force. In addition, the sprockets on the cassette provided with HyperGlyde technology ensure quiet shifting.