The IMPALAPRO set of 2 ceramic jockey wheels 12T-14T aluminum 7075 CNC are perfect for those looking to upgrade their bicycles with high-quality and durable components. CNC-machined for precision and durability, these wheels are designed to cope with 9 to 12 speeds, making them compatible with SRAM and Shimano derailleurs. The ceramic pulleys at 12T and 14T ensure efficient shifting and silence during those silent pedal moments. The navy blue color adds a fresh and contemporary touch to any bike, making this set an excellent choice for both riders and commuters.