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
Pulley Large Demonstration Single, Designed for Classroom Demonstrations, Light-weight, low-friction, and deformation-resistant plastic ensures accurate results, Open to make it easier for users to run pulley cords through them
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