Clear rim tape, "MTB 27.5" classification. Measures 69.85cm (27.5in) long x 4cm (1.575in) wide x 0.5mm (0.0197in) thick and is commonly (though not exclusively) used for mountain bike/MTB and Motocross/MX rim applications. The purpose of rim tape is to protect the innertube from being punctured by the wheel spokes.