Features:. Manufactured with high quality control. Super quality float glass with thickness of 4mm,5mm. High surface hardness: 5 or 6 times of that of normal, hard tobreak, safe to use . Excellent heat endurance: can withstand drastic temperature change . Safety of temp. glass and best cooking effect. Varies types, such as round, square,oval. Size from 12 to 40cm,OEM welcome . Varies color of glass: transparent, blue, green,dark brown, your logo Packing: Exportable carton