Muc-Off Ultimate Tubeless Kit - XC/Gravel 25mm Tape 44mm Valves. The Muc-Off Ultimate Tubeless Kit contains everything needed to get a tubeless-ready wheelset set up and ready to roll. Each Kit contains Tubeless Rim Tape two CNC-machined black tubeless valves and two pouches of No Puncture Hassle Tubeless Sealant.