Designed specifically for use with Brose 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. Steel and Aluminium construction. Compatible with Brose motor systems. SRAM Model ID: CR-XX-BR-D1 TECH SPECS BCD Direct Mount Teeth 36 Chainring Comp. Eagle Transmission (T-Type) Narrow-Wide Design X-Sync 2 Material Aluminum/Steel Primary Color Black Speed 12