The SRAM AXS battery cover is a lightweight protective cowling designed to shield the battery when installed on AXS mountain bike derailleurs. It helps prevent damage from impacts, mud, and debris during trail use. Does NOT fit T-Type AXS derailleurs (e.g., Transmission models like XX T-Type, XO T-Type, GX T-Type). Compatible with original AXS MTB rear derailleurs: XX1 AXS, X01 AXS, GX AXS. Lightweight and easy to install. Adds an extra layer of protection without interfering with performance. SRAM Eagle AXS Rear Derailleur Battery Cover Electronic Shifter Part, SRAM UPC: 710845868931