ply puncture resistant casing. Easy rolling lightweight tread design. Tubeless design But can be used with or without tubes 4 Set Alternating “Check Mark” Design The forward-facing, directional, “checkmark” shaped tread in an aggressive layout is designed to overcome multiple different terrains and obstacles on and off the trail. Perfect for dirt, asphalt, and everything in between. 4- PLY BIAs Rating With a 4 – Ply Bias rating you get the best of both worlds. Composed of 4 separate layers of reinforced, high-grade rubber, the Go Kart Series is perfect for dirt or asphalt racing, and also fits most mini bikes. Grip to Weight Performance Built off the Alternating “check Mark” tread style, the downward force combined with the low tube or tubeless design gives superb grip when turning on asphalt or on dirt tracks. Max Load Rating With a max load rating of 265 lbs at 5 psi (4ply) and 185 lbs at 7Psi (6ply) offers a superb soft yet firm ride that rolls easy and glides around corners