This is an aftermarket product imported from overseas. It's a logo sticker made by thinly slicing genuine pearl shell. The shape is almost identical to recent Historic Collection logos. It's a simple process: just peel the logo from the light blue backing sheet and apply it. For guitar repairs, it's compatible with lacquer, poly, and other finishes. To eliminate any unevenness, apply sanding sealer, etc., and then after sanding smooth, apply clear lacquer for a beautiful finish. The size is approximately 21mm in height, 40mm in width, and 0.15mm thick (including the adhesive layer), which is roughly the same size as the Gibson guitar logo.