Convenient lid offers users a completely sealed beverage until they're ready to drink. When ready to drink, just pull the tab open and lock it back out of the way. Unique lid provides the ability to securely reclose the lid until ready to resume drinking, again and again. The Drink Well Plug™ creates a strong, leak-resistant seal, for security on-the-go. Drink Well Plug™ also serves as a protective shield to prevent contamination of beverages. Fits: 10-24 oz Hot Paper Cups; Material(s): Polystyrene; Color(s): Black; For Use With: Dart® 410RC-J8484, 412RCN-J8484, 316RC-J8484, 420RC-J8484, 410PLA-J7234, 412PLN-J7234, 316PLA-J7234, 420PLA-J7234, IC12-J8000, IC16-J8000, IC12-J7534, IC16-J7534, 410SI-0041, 412SIN-0041, 316SI-0041, 420SI-0041, 424SIN-0041, 410JZ-00055, 412JZ-00055, 316JZ-00055, 420JZ-00055, 424JZ-00055, 410MS-0029, 412MSN-0029, 316MS-0029, 420MS-0029, 424MSN-0029, 410SM-J8000, 412SM-J8000, 316SM-J8000, 420SM-J8000, 424SM-J8000, 410W-2050, 412WN-2050, 316W-2050, 420W-2050, 424WN-2050.