SRAM RED E1 2x Chainring Kit SRAM's lightest stiffest and most durable chainring. Their one-piece construction ensures that none of your effort goes to waste. Features Crisp and accurate front shifts One-piece construction for faster smoother more secure shifting X-Range gearing technology gives you more range and a smoother gear progression SPECIFICATIONSDrivetrain Speeds12Round or Oval Round Material Aluminum Direct Mount Type Direct Mount SRAM 8-Bolt | Sram | Red E1 2X Chainring Kit 50/37T | Aluminum