This is a used Shimano Deore XT M8000 11 speed cassette and CN-HG701 chain.
The cassette is the 11-42 version.
They are used and have some dirt / oil residue.
The cassette is in good condition. The chain is pretty close to 0.75% wear on my Park Tools chain checker, so should be replaced sooner rather than later to avoid premature wear on the cassette.
Please note that a joining link / pin for the chain is needed and this is NOT included.
Thanks very much for looking. Please check out my ebay shop for loads more bike stuff.