The Tubeless Valves is perfectly airtight and keeps the pressure on your tubeless tire. The core is replaceable or can be changed by a valve extender for a higher rim. Valves with removable core Brass valve shaft Rubber squared base for a better seal Specs Sizes: 48 mm (16 g), 80 mm (28 g), 60 mm (16 g) Tube type: MTB, Road Removable valve: Yes