Product Description Increases Resistance to Thermal and Mechanical Shock. Libbeys exclusive DuraTuff treatment is a special thermal after-process for "pressed" tumblers and stemware that produces durable glassware with prolonged service life for the foodservice industry. Look for the DuraTuff name embossed on all Libbey DuraTuff tumbler and stemware products such as Endeavor, Gibraltar, Winchester, Paneled Tumblers, Inverness, Dakota, Everest and Casual Coolers. 0
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