Rubber Stopper, #2, 1-hole

These #3 rubber stoppers are 18-24 mm diameter with one 4 mm diameter hole.

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Get an up-close look at this fascinating green algae! Desmids are single-celled, can only be found in freshwater, and are commonly noted for their symmetry. Each slide includes mixed forms.

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These #0 rubber stoppers are 13-17 mm diameter with one 3 mm diameter hole.

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Pentahydrate form of copper II (cupric) sulfate powder. Copper sulfate is a great chemical for growing beautiful blue crystals. Find copper sulfate powder's density, common uses of copper sulfate, and more below!

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#7 rubber stopper, 1-hole, fits 500ml Erlenmeyer flasks or 250 ml filtering flasks.

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Work through the intricacies of Earth & Space Science with this kit designed for grades 9+.

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Gain a deeper understanding of phase changes and perform experiments to manipulate water's boiling and freezing points. Learn how polarity affects solubility and other physical properties in this high school chemistry kit.

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Uncover the impact of infrastructure. Build and model watersheds to measure runoff differences and investigate human influence on natural systems with 6 learning experiences in this high school Earth Science kit.

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This Microscope Discovery Kit will give you everything you need to explore the microscopic world of protists. It includes the same quality and features as other fine high-school-level microscopes at an affordable price.

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Lift off into the engineering of aerodynamics with the POWERUP 2.0 complete conversion kit bundle! Begin flying in style right away. This kit includes 10 additional full-color templates, 2 waterproof airplane templates, and instruction book.

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