These are our favorite Tubeless Valve stems. They look great, the seal well, and they provide great flow. The new Muc-off valves are stronger and lighter. We've done this by upgrading the aluminum grade from 6061 to 7075. We’ve made them even easier to use by introducing a new machined 6-slot channel in the base, these slots allow the tire to be inflated easier and can be used with most tubeless tire foam inserts.