XO Good Grips Glass Bowls are made of oven-, freezer- and microwave-safe borosilicate. That means they can be heated from 32 F (0 C) to 450 F (232 C) without shattering. Generous rims allow for easy handling when mixing, pouring and cleaning, plus the glass won’t absorb odors or stains. Ready to wrap up? Our Bowls nest for simple storage.