【High-Quality Tumbler】 30 oz tumbler is made of high-grade 304 18/8 food grade stainless steel, anti-rust and lead-free. Stainless steel tumblers are more durable than ordinary cups and can withstand heavy use every season. 【Tumbler with Lid and Straw】 Stainless steel tumblers are equipped with sliding lids and straws. In addition, the slider setting makes it easy for you to carry it around. 【Colored Powder Coated Tumbler】Tumblers are coated with powder. The sweat-proof design is a great way to hold the insulated tumblers without them slipping off. 【Unique Curve Design】Tumblers are designed with curves. This makes it easier to hold and suitable for different groups of people. Double-layer vacuum insulated, so the insulation works well, keeping your favorite drinks cold or hot for several hours. 【Portable Travel Mug】 30 oz tumbler is suitable for most car cup holders and is easy to carry. It is suitable for parties, picnics, and offices, indoors and outdoors.