Speed Evolution's tubeless aluminum presta valve features a patent pending larger recessed locking O-ring, a larger internal diameter to provide for more airflow and less plugging caused by tubeless sealant. The vulcanized base includes a raised center so that the sealant does not seep inside. The base is big enough to seal a schraeder sized valve hole and conforms well to the inner cavity of most rims. The valve core is removeable to easily inflate and add sealant. Speed Evolution valves are made from aluminum, making them half the weight of brass. The aluminum construction also makes it possible to anodize them. The valves come in gold, green, red and pink. They're the perfect accent to a customized bike.