DIY Flat Round Cup Mat Silicone Molds, Coaster Molds, Resin Casting Molds, WhiteSize: about 3.39 inch(8.6cm) in diameter, 0.55 inch(1.4cm) thick, inner diameter: 3.15 inch(8cm).Temperature Limit: This mold permitted useful temperature range is between -20â to 200â.