The Dart 20SL disposable translucent plastic drink-through lid comes in 10 packs of 100 lids, has precut slots for a straw, and is suitable for use with the 32 oz. Dart 32AJ20 insulated foam cup. The lid seals the cup to help prevent spills. The precut straw slots facilitate drinking cold beverages through a straw (sold separately) while the lid is on the cup. The lid has four compressible buttons to identify the contents as "Cola," "Diet," "RB" (root beer), and "Other." Dart manufactures disposable products for the food service, retail, and food packaging industries. The company, founded in 1937, is headquartered in Mason, MI.