Rubber Stopper, #4, solid

These #3 rubber stoppers are 18-24 mm diameter. #3 rubber stoppers fit liter soda bottles.

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Study human anatomy with this set of 16 high-quality, hand-prepared microscope slides.

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Pack of two extra large test tubes, 20 x 150 mm.

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Take a close-up look at these specimens to make your biology studies come alive! The 25 professionally-prepared microscope slides in this set include a variety of specimens commonly studied in high school.

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Use the Atoms, Isotopes & Ions Kit to build a series of atoms with various electron configurations & energy levels. Comes with a detailed teacher's guide & student worksheet! Complete in 2 - 4 class periods (40 min. each).

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Upgrade your microscope studies with a Microscope Digital GT Camera 5.0 Megapixel. Includes microscope camera, editing software, C-mount + 3 eyepiece adapters, calibration slide, and USB cable. Attaches to your own microscope.

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These #4 rubber stoppers are 20-26 mm diameter with one 5 mm diameter hole.

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Make elephant toothpaste with this excellent Elephant Toothpaste Science Kit. Add dish soap and potassium iodide to hydrogen peroxide in a graduated cylinder, and watch in amazement as huge amounts of foam stream forth!

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Diameter of 18-24 mm. Fits plastic soda bottles.

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These solid No. 2 rubber stoppers are 16-20 mm diameter.

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