Federal Couragia M/T Mud-Terrain Radial Tire - 37x12.50R18 128Q Large aggressive shoulder lugs. Strong protection block on upper shoulder for exceptional bruise, impact, cut resistance and protection from other off-road hazards. Uniquely designed incremental block edge improves clearance of dirt and sand for constant performance. SRG(Sloped Radius Gradient) block design increases block stiffness, enhances performance, and delivers serious off-road traction. Bar at bottom of groove clears mud and rock particles and provide ultimate off-road traction. Specially formulated advanced tread compound resists cuts, chips and abrasions for long life and even wear.