Versatile profile with grip and good rolling characteristics. The foundation of all Active Line tires is the high-quality 50 EPI casing. Coarse 20 or 24 EPI casings are no longer available from Schwalbe. Additionally, the K-Guard provides effective puncture protection for all Active Line tires. Puncture protection level: 3K-Guard, Schwalbe's minimum standard for protective belts. The belt is made of natural rubber and reinforced with Kevlar fibers. Together with the 50 EPI casing, all Active Line tires are well protected against punctures. Basic Compound: the versatile quality mixture for all applications.