. Unlike its butyl predecessors as used by may other brands, the Caffe?latex Rim Strip is very light, puncture-proof and transparent. It allows the tubeless conversion of most standard mountain bike wheels, using Tubeless or Tubeless-Ready tyres and Cafflatex sealant. Size M (30mm): is for rims with external section between 25 and 29mm. Features: Lightweight: 30g for a strip makes it competitive with tubeless tape (with a weight ranging between 9 and 20g per wheel) and simply superior to old butyl liners (with limited strength and weighing over 65g per wheel). Highly resistant: made using a proprietary polymer blend, Cafflatex Strip has very high mechanical strength and resistance to punctures. It?s also very stable from a chemical standpoint and cannot be damaged by water or Cafflatex. Easy to use: Cafflatex Strip is the ultimate tubeless solution for very difficult rims such as aluminium rims with mat surface finishing or carbon rims with mould release treatment, where no tape sticks very long Buy Effetto Wheels & Tyres from Chain Reaction Cycles, the World’s Largest Online Bike Store.