Product Description Maintenance: Please wash before the first use. To avoid scratching your tumblers, do not clean with abrasive spongers, scrub brushes, or any other abrasive cleansers. The drinkware is toprack dishwasher safe. However, over a period fo time, all acrylic can dull or develop sall hairline cracks due to high heat, drying agents, or variations in dishwashing detergent addictives. 0
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