Crystal Clear Polystyrene Petri Dishes (Sterile)- Sleeve of 20 Dishes These Petri Dishes are ideal for pouring your wax paints or wax medium into Each dish holds 3 fluid ounces Simply fill the dish with your melted paint and let it cool to room temperature Ideal for storing paint using for your own mixed colors or making small cakes of paint out of a large batch Each dish comes with a lid and they are also ideal for sorting and storing small objects