These Presta valve stems are compatible with tubeless rims and tires for road, gravel, mountain, and fat bike wheels. The kit includes two Presta valve stems, two machined aluminum caps, two nuts, two extra valve cores, a unique machined aluminum valve core remover, and three rubber base options for compatibility with more rim internal shapes. 44mm and 60mm stem length options Slotted stem base for compatibility with tire inserts Oversized stem nut for better sealing and easier removal Stem threaded below rubber seal for better performance on single wall rims Three rubber bases included: two types of cones (one installed), one channel Replacement parts available via Wolf Tooth Right To Repair, including cap kit with two caps, nut kit with two nuts, and valve cores