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Can't decide? Order a Particle Pack!

 

 A sneaky, elusive little guy who is a bit more massive than the electron-neutrino. Like his svelte brother, he too prefers to remain undetected. He is also part of the Lepton 6-pack.
Approximately 0.8 oz/22 grams; 5 inches/12 cm across.
For ages 5 and up as it contains glued-on/small parts.

 

 

 

 

 

 

 

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