This is the ARRMA Big Rock Crew Cab 4 X 4 3S BLX and its Designed Fast, Designed Tough and built for bashing. The big rock ready-to-run monster truck delivers a thrilling combination of toughness, street truck style and 50+ mph speed capability. Built on the powerful 4X4 BLX platform, its precision aluminum, tough steel and composite materials come together for an easy-to-maintain, super-durable vehicle design that’s now been upgraded to further increase the monster truck’s impressive performance and durability.