Amazon.com : BOLANY 12 Speed MS Cassette 10-50T 10-52T Ultralight Mountain Bike Cassette Compatible with Shimano MS Fit for MS Freehub Body (12s 10 50t) : Sports & Outdoors
VG Sports MTB Bike 12 Speed 11-52T Cassette Flywheel Gold fit Sram Shimano M8000 | eBay