Sterile Petri Dishes with Lid - 90 x 15.8 mm, Pack of 20These 90 x 15. 8mm sterile polystyrene Petri Dishes with lids come in a convenient pack of 20 and are ready to use straight out of the box. Designed for single use, these eco friendly petri dishes support a wide range of biological and microbiological experiments in educational settings. They are sterile to prevent contamination and can be recycled after use, offering a practical solution for busy classrooms. Why this product is beneficial for