This is a genuine HPI Racing clutch spring set including 0

Allows for Oversized Bearing use

Ready to run on N gauge track

Great for display and maintenance

ARRMA BIG ROCK 223S BLX 4X4 1/10 RTR Brushless Monster Truck – ARA4312V4 Measurements This is a genuine HPIARRMA BIG ROCK 223S BLX 4X4 1 10 RTR Brushless Monster Truck Take your bashing to the next level with the ARRMA BIG ROCK 223S BLX 4X4 RTR Brushless Monster Truck. Built for drivers who want a tough, fast, and realistic 1 10 scale monster truck, the BIG ROCK 223S gives you the flexibility to start on 2S power and step up to 3S speed when you are ready. With a Spektrum 3100Kv brushless motor, 4WD drivetrain, Dynamic Stability Control, and throttle