This Koswork rear shock tower is machined from 3mm carbon fiber for use with the Associated RC-10 89 Worlds platform. The woven carbon fiber construction provides a lightweight, rigid mount for the rear shock absorbers. It is a direct replacement for the factory plastic tower and installs using the existing mounting holes. Features: 3mm carbon fiber construction Designed for the Associated RC-10 89 Worlds Lightweight rigid shock mount Drop-in replacement fit 7/7/26 cs