This is a pair of pre-mounted Trencher X 3.8" All Terrain Tires. Leave a mark with your Monster Truck wherever you are with Pro-Line's Trencher X tires. The Trencher X tires are designed to give your MT optimal traction on just about any surface. Super cool horizontal H-shaped treads give your MT ridiculous amounts of forward bite. With tread height at ?" tall, you"ll find that durability and longevity are second to none. "The tires provide more stability and tons more traction on any surface, in turn they make a monster truck unstoppable. When using the tires on gravel or any other loose surface they grip enough to keep you from spinning out but still allow you to slide, to drift or do donuts. The traction that the tires provide is really the best of both worlds and seems to be made for bashing. But when they are taken out on a track they perform like a tire that's made for racing! They handle clay surprisingly well the tires were sticking to the corners and helping me rip wheelies down the straight away.." BigSquidRC.com