These glass drying trays from Corning® are designed for use as drying, staining or developing trays. They can be used with electrophoresis gels or paper chromatography. The trays are made from a thermally resistant low-expansion borosilicate glass and will withstand all autoclaving methods. Trays feature a heavy duty rim. Do not place over direct heat; for oven use only. Some dish sizes are slightly oval in shape. Reusable.