Maxxis Roamer Black Wire/60 DC/KI Tires The Roamer is ready for anything from your daily commute, a trip to the store, or a long weekend of touring the back roads KI - Kelvar Inside, Kevlar belting beneath the tread SW - SilkWorm increases puncture and tear resistance with a reinforced breaker beneath the tread surface DC - Dual Compound tread provides a lower rolling resistance center paired with extra grip for the corners B2B - 2 ply nylon breaker beneath the tread surface made for road tires