RC car fans, this one's for you! This is a differential locker spool made specifically for the Traxxas Drag Slash 1967 C10 RC car. It's an upgrade part that replaces the stock diff to lock both rear wheels together. Why do that? Well, it sends power equally to both wheels instead of just one spinning, which gives you better control and traction, especially for straight-line speed or drifting. It's crafted from high-quality aluminum alloy, so it's strong and lightweight (only 12g). The blue color looks sharp, and it's designed for easy installation—just swap it in. Non-destructive mounting means you won't ruin your chassis. If you're into tuning your RC car for better performance, this spool is a simple and effective mod. Comes as one spool in the package. Any questions, the seller is ready to help. Go on, give your Drag Slash an upgrade!