Designed specifically for use with Shimano Steps motor systems, this chainring is the lightest, most advanced e-specific ring ever designed. Pairing performance and design aesthetic to give you the highest-end E-MTB ring SRAM produces, the ring is also compatible with SRAM's Aero-Guard. Model: CR-XX-SS-D1 Steel and Aluminium construction. Compatible with Steps motor systems. AeroGuard Compatible that fulfills EN 15194:2017 standard