The Lid and Slider are made of AS crystal clear plastic which are BPA free,Eco-friendly,Sturdy and durable Non-toxic.The size is about 3.1*2.7*0.7 inch,only fit for 20oz Skinny Stainless Steel Tumblers.The leak-proof lid is designed with double-sealing technology, so you don’t have to worry about spills, especially when filling hot drinks or driving.Perfect airtightness,not only can prevent your drink from side leakage,but also can keep your cold or hot drinks for a longer time.The lids can open and close,Hole cover allows direct sipping or use with a straw.Easy to open and close, easy to slide, and very Light and easy for carrying out.Open/close sliding cover design,convenient to use.The sliding lid design allows you to not touch your nose when drinking water.Tumbler lids has a silicone gasket lining the edge to prevent splashing and major spillage while turning over the tumbler. An air hole on top of slider according airflow ergonomics which helps reducing splashing.Some styles lids with handle,this design can be more convenient,whether at home or out,easy to carry the tumblers.The design with a straw is more environmentally friendly and sanitary, can be used separately and independently, and is easy to clean.There are some lids to store snacks and ice cubes,the design is more fashionable and life-oriented.This replacement lid is designed to fit 20oz Skinny Stainless Steel Tumblers Only. If you need it for other brands, please check precisely on size, which is shown in the product picture.