Rubber Stopper, #6, 2-hole

These # 6.5 rubber stoppers are 27-34 mm diameter with two 5 mm diameter holes.

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These #3 rubber stoppers are 18-24 mm diameter with two 4 mm diameter holes.

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hese #6 rubber stoppers are 26-32 mm in diameter with one 5 mm diameter hole.

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These #6 rubber stoppers are 26-32 mm in diameter.

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#7 rubber stopper with two 5mm holes.

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42-50 mm diameter. Fits many vacuum bottles.

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Sodium tetraborate (Borax) is an organic compound with the formula Na2B4O7. Borax powder is a naturally occurring mineral with many uses. Use it to make a bath bomb, a bouncy ball, or mix it with white glue to make slime!

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Enhance your student's science and engage them in Earth & Space science with this hands-on, inspiring kit. Discover stars, constellations, weather vs. climate, and erosion. Learn about pollution, oil spills, and their effects on the earth.

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Stop searching for science supplies before every lab. Get what you need in one box with this lab kit!

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Explore the wonders of electricity by building and experimenting with a working electric motor and generator!.

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