High-quality dishes for easy staining! These staining dishes holds standard 1" x 31" microscope slides. The jars are made from thick annealed glass with slots molded into the glass. Each slot is designed to hold two slides back to back. These staining dishes holds standard 1" x 3" microscope slides. The jars are made from thick annealed glass with slots molded into the glass. Each slot is designed to hold two slides back to back.