Build Grinder, one of the most popular monster trucks in Monster Jam®! This set comes with 37 parts, including a buildable body shell that works within the K'NEX system. There is also new and improved working suspension, big, chunky tires and a K'NEXman driver! Authentic logos and graphics recreate the look of Grinder. Once built, this monster truck represents 1:43 scale and performs like the real thing. You can even use the wedge-shaped box as a ramp! Step-by-step building instructions included. Recommended for builders ages 5+.