This is the SRAM X-SYNC 2 Bosch Chainring, Speed 11 / 12.

Features:

• Sharp, narrow tooth profile and rounded chamfer edges help manage a deflected chain
• Mud-clearing recesses
• An integral component of the SRAM 1x drivetrain

Product Specifications:

• Chainring Size 36T, 38T
• Bolt Circle Diameter (BCD) N/A
• Chainring Comp. N/A
• Speeds 11 / 12
• Compat - Yaw No
• Material (Chainring) Steel
• Color (Chainring) Black
• Narrow Wide Design X-Sync 2

Vendor Item No:

• 00.6218.013.003 (36 Teeth, BCD N/A, Narrow Wide Design X-Sync 2, Speed 11 / 12)
• 00.6218.013.004 (38 Teeth, BCD N/A, Narrow Wide Design X-Sync 2, Speed 11 / 12)