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The toys are not actually made out of the same type of glass that you are probably thinking of. It's a boro-silicate glass, that is usually annealed or tempered. It is very strong, and I doubt you would ever have a problem with one breaking - even from a fall on a hard surface (within reason).
These toys, are safe and very hygenic (very easy to sterilize!). Plus, they look cool, and as a guy, I find that the clarity of the glass is a huge turn-on when a girl is using one.
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