Rubber Stopper, #3, 2-hole

These #5 rubber stoppers are 23-27 mm diameter with two 5 mm diameter holes. No. 5 rubber stoppers fit Pyrex 125 ml Erlenmeyer flasks.

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With Thames & Kosmos Kids First Coding & Robotics, kids age 4-8 learn sequencing, loops, events, conditionals, functions & variables. The 64-page manual has 30 coding lessons. No tablet, smartphone, or computer required!

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This kit is designed specifically for the Catholic Text Biology course. Get 15 items you need to complete the High School Biology text.

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42-50 mm diameter. Fits many vacuum bottles.

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Dive into dissections with this classroom set of personal protective equipment (PPE)! This classroom dissection safety set comes with the PPE your students need to safely and successfully dissect any organism we offer.

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Build a functional mega hydraulic arm in less than 30 minutes. This mega hydraulic arm uses eight syringes and four pieces of rubber tubing to maneuver the claw and arm using some of the same principles that drive real-world machines.

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Investigate shade balls and the role they play in the cycling of matter and energy through ecosystems. Your 3-7th grade student will model how energy flows through ecosystems using food chains and food webs in this month-long biology kit.

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This full month of hands-on learning kit engages your student in electrical circuits. They'll learn about the conductivity of materials, compare designs of circuits and switches, and design a model home circuit.

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The best-selling Microscope Discovery Kit just got better! In addition to a high-quality microscope and a wide array of experiments and accessories, the kit now includes a 5 MP digital camera for capturing photos and videos of a microscopic world!

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This raw, gray limestone specimen has a dull gray appearance and slightly chalky feel. Made mostly of calcium carbonate, so it bubbles when in contact with acid.

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