Features: The slider can open and close for direct sipping or for a straw. 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. Specifications: Color: Crystal clear Material: AS plastic Product diameter: 3.74 inches 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. This lid will help with accidental tips and spills but NOT guarantee 100% no leaks if inverted for a long time. Package includes: 2* Spill proof and splash resistant tumbler lids
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