http://www.digginter.com/Shopping/kenda-kaliente-road-racing-bike-tire/ Protection cap iron - Kenda's best puncture resistant material. This is a layer of material in the tread, ie, the pearl of pearls. In addition to helping prevent punctures that adds strength to the sidewalls of the wheel. Special L3R Pro compound Racing - L3R PRO is an exclusive edition L3R. Benefits are low rolling resistance, increased life and enter a lighter tire. Kenda tire cover lighter lowe Sat, 09 Jan 2010 06:42:08 CST en