Magnum Steel 30 oz Splash Proof Sliding Lid - Fits 30 oz Tumblers

30 oz Sliding Lid for Tumblers. Splash proof. Features: Contoured sip hole allows for direct sipping or for use with a straw The sliding closure is made from New Tritan crystal clear plastic, which helps reducing spill and splashing. Come with a black silicone o-ring around the base, and it helps cover the tumbler more tightly. Designed with an air hole on top of slider according airflow ergonomics. Color: crystal clear Material: Tritan crystal clear plastic (BPA free), silicone Product diameter: 3.94 inches Fits: 30 oz Tumblers Notice It is easy to clean and dishwasher safe, but avoid using in microwave. The air hole is designed to keep a same air pressure inside and outside the tumbler, making it convenient for you to drink water. So it is not designed to create a watertight seal and will not prevent leakage if tipped over or held at an improper angle.