The purpose of rim tape is to protect the bicycle wheel's inner tube from spoke holes, which will puncture the tube if exposed inside the rim. Faulty rim tape will cause recurring flats, so it's something to look at when diagnosing the cause of frequent flat tyres. If installed properly though, rim tape often lasts for the wheel's lifetime. But if it's suspected of causing recurring problems it will need to be replaced. Joe's No-Flats 21mm wide Tubeless Yellow Rim Tape is a high-quality, lightweight Nylon reinforced spoke tape manufactured by Adhestick. The roll has 9 metres of tape which is enough to do 5 x 26" rims, 4.5 x 650B rims or 4 x 29" tyres which should keep your tubes very well protected from nuisance punctures.