dishes are made of polystyrene plastic and by ethylene oxide, individually sealed packaging to accurate quantitative analysis and detection. PS: This is plastic dish, please do not heat it more than 50 degrees or it will melt. Our dishes weigh 16 grams, thicker and more durable; with highly transparent, uniform thickness, bottom flat , no distortion, strong- lidded dishes. Facilitates air circulation, provides sufficient oxygen and carbon dioxide, regulates temperature and humidity, thereby ensuring that cells are in the most suitable growth conditions. 24pcs 90mm x 15mm dishes + 20pcs Test Pipette Droppers (0.2ml) dishes are commonly used laboratory instruments for culturing and observing microorganisms, cells, tissues and other biological samples; Widely used in biology, medicine, bioengineering and other fields. Colour:As Shown Material:plastic Package Contents: 1 set x dish Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.