I bought this on Mercari when I was into Mini 4WD. You can achieve precise processing by sandwiching and shaving carbon fiber between the two plates! Retail Price: ¥2600 per plate The following is a quote from the seller's description on Mercari: This is the original genuine sliding damper carbon processing jig ver. 3.5. It's a double-spring specification, and the sliding part remains the original width, but can be expanded to 3, 4, and 5 mm. New holes for step-down processing can also be made. Holes for the plus lid can also be made. It is a laser-cut stainless steel product. Please make the lid to your liking. Sliding Damper Slide Carbon Mini 4WD