Approximately 20mm round bezel cups with one loop. 1.5-2mm inner diameter loops. 2-2.5mm deep. These shallow bezels use less filler and shorten curing times! Measurements do not include loops. Size listed is bezel exterior; bezel interior is about 1mm smaller. Plated steel. These work great with EasyCast and other resins, epoxies, glazes, Friendly Plastic®, and polymer clay.