Glass vibrators are simply a vibrator, whether it is a single or multi-speed style that is encased in a glass sleeve, which is typically fashioned from Pyrex or another brand of borosilicate glass.
A Pyrex glass vibrator offers advantages over plastic, the primary ones are that they are much cleaner and free of chemicals such as phthalates. The glass sleeve also transfers the vibrations very well so you shouldn't notice any difference from what you're accustomed to. We offer several styles of glass vibrators from reputable brands just check out citishop for a resonable prices.