I loved mine, we even brought them to school to drive the teachers nuts. The fun lasted until stories about them causing eye injuries caused my folks to throw them out.click - clack
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some were made of glass but the ones i had were plastic.
http://www.inthe80s.com/toys/clickclacks0.shtml
looks like you can still buy them, they have vintage one here:
http://www.timewarptoys.com/clackers.htm
My other dangerous toy was my chemistry set, this was back in the old days when they actually came with fun chemicals & alcohol burners.