The Losi LOS261010 Control Arms & Hardware, Crash Structure is a replacement set designed for the Losi Promoto-MX and Promoto-SM 1/4 scale RC motorcycles. This comprehensive kit includes essential components such as a shock mount, upper and lower control arms, a hinge pin, and pivot bushings, all crafted from durable plastic. These parts are crucial for maintaining the motorcycle's suspension and crash protection systems, ensuring optimal performance during rides. Regular maintenance and replacement of these components help preserve the handling characteristics and longevity of your Promoto-MX or Promoto-SM model.