With grip and good rolling characteristics. The frame of all Active Line tyres is the high-quality 50 EPI carcass. Schwalbe no longer has any rough 20 or 24 EPI carcasses. In addition, K-Guard provides effective puncture protection for all Active Line tyres. Breakdown protection level: 3K-Guard. The Schwalbe minimum standard for protective belts. The belt is made of natural rubber and reinforced with Kevlar fibres.