First, I'd like to comment on how nice it is that the mainstream manufacturers are starting to introduce a much larger percentage of their toys in silicone, glass, or other durable materials.
I was wondering about the construction of the dildo. On examining it I noticed that the suction cup/base was glued in and that there was a small vent hole cast in near the base. Are these dildos hollow and filled? If so, what is the material in the core?