The Ruby G is made of Pyrex glass, which means it's strong, smooth, and safe. It's non-porous, so it can be shared (as long as it's sterilized between users). Pyrex glass is great because if you happen to drop it and it breaks, it will break into a few large pieces rather than a million tiny sharp pieces. With normal use, glass won't break or chip, though. If you happen to drop the toy, inspect it for cracks or chips and if you find any, discontinue use immediately. Glass can also be heated up or cooled down for temperature play using warm or cool water, respectively.
There is no texture on the Ruby G. It's completely smooth, without any nubs or bumps.