The 4 oz. White Vented Flat Plastic Lid for 4 oz. Hot Cup is the perfect topper for any of International Paper's corresponding 4-ounce hot cups. It's made from durable polystyrene that can withstand hot temperatures and has a small vent to let steam escape from the container. It will also provide a leak-proof seal when you snap it onto the cup, so it will be ready for mess-free delivery or take-out. This lid, sold 1000 per case, perfectly coordinates with the SoHo Design Paper Hot Cup (SMR4).