Maxxis Overdrive 700x38 Black WIRE27 SC/MS Tires Hybrid tire with reflective side stripe for all weather, road conditions. SC - Single compound casing for a durable, dependable tire MS - MaxxShield , represents the pinnacle of flat protection with 2 layers of puncture resistant belting K2 - Maxxis exclusive fabric that offers greater puncture protection than standard Kevlar without effecting ride quality MXPR - MaxxProtect, A poly-fiber material positioned between the tire tread and the casing designed to maximize puncture resistance in select hybrid models