Ramped knobs for low rolling resistance, lateral channel cut knobs for braking and accelerating, lugged side knobs for cornering. UST model features a 27tpi casing with Silkworm protection for maximum puncture resistance. SuperTacky: a special low rebound, high traction compound. 3C DH: hard base layer and two progressively softer top compounds for supreme grip and stability. Single Compound: one compound throughout the tread optimized for longevity and performance. DH models have a tough 2-ply casing and butyl sidewall reinforcement.