Material and use: Made of borosilicate glass 3.3 (coefficient of linear thermal expansion (3.30.1) x 10-6/k), thickness 2mm, temperature resistance 400C, a special material Glass, special low expansion glass, corrosion resistance, high temperature resistance, strong, hard, transparent and chemically stable. Widely used in plant material culture, microbial culture and animal cell content. Size options: 60mm 75mm 90mm 100mm 120mm optional. Meet your multiple needs and uses. Each item includes 5 petri dishes of the same size. Each piece contains a top cover and a bottom box. The top cover acts as a dust cover. The bottom dish is flat, the top lid fits snugly, and the workmanship is neat, flat and smooth. Why choose us: Unlike single-use plastic petri dishes that can only support a maximum temperature of 80C, the glass Petri dishes have a temperature resistance higher than 400C. More chemicals have more corrosion resistance. For laboratory personnel, they are easier to clean and handle. They can be repeated many times, which is more environmentally friendly and economical. Packaging method: The packaging department has accumulated global sales experience, taking into account all geographical factors and shipping, to form our own unique and professional packaging method. Before packaging, our staff checks for scratches, burrs and manufacturing defects. It removes defective items and selects only better quality items. Our proprietary packaging method helps minimize shipping damage.