Made of Acrylic, a molded plastic with great clarity and transparency. This plastic is an excellent substitute for glass. Acrylic will not yellow and the colors are weather and sunlight resistant. Although it resists most chemicals found in normal use, dishwasher rinse agents and heat can cause cracking and crazing(hairline cracks) along the sides of the tumblers. Hand wash all acrylics to maintain optimal appearance. If washed in the dishwasher, use a low heat rinse cycle. Not recommended for use in the microwave.
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