- 11-13-15-17-19-21-24-28-33-39-45-51 Cogs - Crowns: Steel - Spider and Locking: Aluminum - Chain Compatibility: 12 speed - 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. 653g - OEM package (This item is exactly as pictured and does not include retail package) Contents: 1 pc/pack