For kid's science experiement to monitor plant based growth under different content and environment conditions, make your child feel like professional scientists to have their own petri dishes! Features - Color: Transparent. - Material: Plastic. - Size:9.00 x 9.00 x 1.50cm/3.54 x 3.54 x 0.59 inch. - This petri dish set comes with 50 pcs petri dishes in different sizes. - Every petri dish made of durable plastic material, which is a useful tool for you in science experiment. - All items in this set are made of safe plastic, which are durable, reusable and eco-friendly. - Of course, you can dispose them after experiments where cultures might contaminate each other. - This product set are perfect for experiment, biology, microbiology studies. Packing list: 10 x petri dishes (35mm)10 x petri dishes (60mm)10 x petri dishes (90mm)10 x petri dishes (70mm)10 x petri dishes (55mm)