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So Ceramic sex toys?  Why?  Well a very large amount of people have a allergic reaction to silicon, poly, etc  These are basically "GLASS"  The bottom is hollowed and thick walled. A vibrator can be applied at the base  and away you go. They can be washed with soup and water or dishwasher but my scare the appliance man . Warmed by placing in fold of you body, put in the Fridge.