The Muc-Off Tubeless 44 mm Valve Kit contains strong and light valves. This is done by upgrading the aluminum grade from 6061 to 7075. They feature 6 slots machined into the base of the valve stem allowing them to be compatible with most tubeless tire inserts and allow your tubeless sealant fluid and air to flow freely when running tubeless tire inserts. The Muc-Off Tubeless 44 mm Valve Kit is supplied with 3 sets of different-shaped rubber inserts to fit a variety of rim shapes and create the perfect value to rim seal.