Type:Round/Double Chainring.BCD:107.Color:Black.Hardness:150 HB.Arms:4 spider arms.Material:7075-T651 Aluminum, from Aleris USA.Process:CNC, anodized surface.Fit:SRAM FORCE AXS Potentiometer, FORCE (FC-FRC-D1).Speeds:For FLAT TOP 12 speed AXS chain.Not compatible with any other chain.Note:Can only be used in complete set and is not interchangeable with other brands.Screws included.46 / 33 transmission - 161 grams