Does Just Add Flesh sell hollow or liquid filled glass?
Never, never, never! There are many ‘glass’ products out there that are no more than an outer glass shell with liquid or gel inside. Some claim this is done for extra sensation, pleasure, etc. But the fact is that these can be machine made (rather than handmade like good quality Pyrex Glass Dildos) and as such are much cheaper to produce. You do NOT want to buy low quality glass products.
