tempered round glass It' s also named round tempered glass, round glass tempered, tempered light glass lens, tempered small size glass, tempered glass disks, light glass, tempered light glass disks, round tempered glass It' s made by float glass in high quality exellent optical performance then tempered to obtain high temperature resistance. Thickness: 1mm - 20mm Diameter: 20mm - 100mm Appearance: transparent, sandblasted Edge: raw cut, grinding edge Characters: exellent optical performance Temperature: 280 C Packing: in cartons.