Watch Glass/ Cover Lid for Beakers and Flasks/ Evaporation Dish, Polished with Ground Edges for safe handling, Material: glass, Quality glass, The 2.0mm glass thick construction resists shattering, Can hold small samples to use under a low-power microscope, 3in (7.5cm) in diameter
Petri Dish, Sterile Polystyrene Are 70Mm In Diameter With A Depth Of 15Mm, They Each Have A Lid And A Bottom Piece, Two-Piece Polystyrene Petri Dishes Are Sold In Sleeves Of 20.