Icicles No. 32 is made out Borosilicate glass, which is another name for Pyrex. The box states that it is hand blown, nonporous, hypoallergenic, body safe glass. It is extremely user friendly because of this. It can be slowly heated for temperature play, or slowly boiled to sterilize. You do not want to rapidly heat or cool down this toy. Even though it is tempered glass, it can still break, and rapid temperature abuse may weaken the glass.
The one concern I have with the material is the red color. I'm not sure if it's a film that can be scratched off, or if the color is blown into the glass. So far, I haven't had any problems with scratching. I do not see any visible wear on the color what so ever, so it may not be an issue.
It does not have a weird taste or smell. Because it is nonporous glass, it will also not hold any tastes or smells after use.