GBB Tumbler Office Coffee Mug With Lid, Spill-proof High Quality Lightweight Cup Double Walled Stainless Steel Liner For Tea Water - Coffee #1 Classic MUJI Minimalism Look. Designed for Office for its sharp color and slippy shell with lid and handle. #2 Tumbler Technology Spill Proof. Designed for Office for the bottom coming with a small but powerful air valve. With the aid of air pressure, the cup would be held on the table without spill out. And when you take it vertical upward, the valve will automatically unlock, so will not feel pain and keep your documents and laptop safe from coffee and water. #3 Food-Grade Safe&Health Mug. Made out of environmental resin and 100% BPA free design. #4 Campact & Lightweight.About 3 inch at the base, 3.75 inch at the top and stands about 5 inch tall; 12 ounces Only. #5 Take This Cup Start Your Cool Business Life.