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Outer bowl: High-grade 18/8 stainless steel. Therma-S’well® triple-layer vacuum insulation to keep contents cold or hot, leaving no condensation on the exterior.
Prep bowl: BPA/BPS-free. Made of clear Tritan™ (with a leak-resistant, pop-top lid) that is safe for use in the refrigerator, freezer, dishwasher, and/or microwave.