Entity RT40 is designed to work with tubeless-ready rims from 30-37mm in width. Double wrap the tape for an airtight seal on your road or mountain bike tyres. The tape is made from biaxially oriented polypropylene, which provides incredible resistance to moisture and temperature variations. This has been combined with a silicone adhesive to give incredible tackiness in the most extreme of environments. FEATURES: Creates durable, airtight seal over spoke holes for a dependable tubeless setup Completely non-porous vapour barrier seals rim interior from moisture Low friction surface helps tire beads slip into place 40mm wide 10m, long enough for about 3 rims double wrapped.