- 11-13-15-17-19-21-24-28-33-39-45-51 Cogs - Spider Material: Aluminum / Red Anodized - Chain Compatibility: 12 speed - A7075 Aluminum 45-51T Sprocket - Aluminum Lockring & Spacers - Compatible with 12 speed long cage derailleur (If you would like to use medium or short rear derailleur, you have to purchase a Cassette adapter) - Color: Black (as pic. shown) - Weight: Approx. 549g - OEM package (This item is exactly as pictured and does not include retail package) Contents: 1 pc/pack