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What are the pop up buttons for on your plastic cup lids that you get at fast food restaurants? - Quora
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Solo L28BNR 28-32 oz. Translucent Flat Plastic Lid with Straw Slot and Identification Buttons - 120/
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Amazon.com: Dart Solo L16BL-0100 12-21 oz. Translucent Flat Plastic Lid with Straw Slot and Identification Buttons - 125/Pack : Health & Household
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