They do the job fine. I'm just sanding down some dental work that catches on floss, and these guys slide easily between even tight teeth. There is a 'coarse' side.
Dental Abrasive Stainless steel Strips 4 mm wide - 5 pcs. One side, fine grit with gaped center. Package: Stainless steel abrasive diamond strips (fine grit) 4 mm.
The Microdont Polyester can be used for a great polishing and finishing on the composite, and have at the same strip side abrasives with medium and fine grit.