Specification: 100% brand new and high quality guaranteed. Fits for Rambler, RTIC, Ozark Trails and most other 20 ounces, 30 ounces tumblers. Help prevent spill while turning over the tumbler and keep your drink insulated. Closure with straw friendly opening. Made from AS crystal clear plastic. Come with a black silicone o-ring around the base, which helps cover the cup tightly. Designed with an air hole on top of slider according airflow ergonomics which helps reducing splashing. Package: 2*Spill Proof Lid.