The Discoverer STT PRO is CooperÆs most advanced extreme tire to date! The Discoverer STT PRO provides exceptional traction and performance in some of the harshest terrains on Earth. The distinctive tread design and compound provide remarkable on the road performance without sacrificing off-road traction. CooperÆs advanced mud terrain tire features 3-Ply Armor-Tek3 along with an aggressive 3-2 center rib design. Push the Discoverer STT PRO to the limits and youÆll ôdiscoverö what your vehicle is truly capable of!