They are addictive! I bought these for my son who needs to fidget with his hands (and I want him to move them instead of ripping the hem of his shirt). They work well and are virtually silent. The faint noise they make is not audible in the classroom unless it's quiet now, but even then it's very quiet! I ended up getting one and fidgeting during meetings at work. When I have my hands full I can concentrate better - I can see why my son likes them!
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