The SRAM GX Eagle 12-Speed Rear Derailleur is a high-quality component designed specifically for mountain bikes. With a sleek black color and long derailleur cage length, this rear derailleur is compatible with 12-speed bikes and is made by the reputable brand SRAM. This durable and reliable part is essential for smooth and precise gear changes while out on the trails. Perfect for cyclists looking to upgrade their bike's performance, the SRAM GX Eagle Rear Derailleur offers durability and efficiency in a sleek design.