Those small glass tubes containing three tiny ball bearings are most likely "Newton's Cradle" demonstration tubes—but more commonly, they’re actually vial-style spirit levels or educational physics toys. However, the specific configuration you're describing—a sealed glass tube with exactly three small metal balls inside—points strongly to one classic item:
🔍 They’re “Agitating Capsules” or “Mixing Balls” from Old Medicine Vials
But here’s the more precise and likely answer:
✅ They’re “Vortex Mixers” or “Sample Agitator Tubes” (Lab Use)
In laboratories, small glass vials sometimes contain stainless steel or glass beads (often 2–5) to help mix or homogenize liquid samples when placed on a vortex mixer. The beads create turbulence, ensuring thorough blending—especially for viscous or suspended solutions.
However, if these are loose, standalone tubes (not part of a kit), there’s another possibility…
🎲 Most Likely: They’re “Klacker” or “Clicker” Toys (Vintage Desk Toys)
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