Caffeine Molecule - Glass Coffee Mug - Makes a Great Gift for Science Buffs! DESIGNED TO DELIGHT - Enjoy your morning dose of caffeine with a clever design! This coffee mug is the perfect conversation starter, and sure to bring the inner nerd out in anyone. BIGGER IS BETTER - This extra-large mug holds a generous 13 oz of your favorite hot coffee or tea, great for those days you really need a fix. SUPERIOR QUALITY - Made from the highest-standard clear glass for outstanding durability. Heavy bottom and thick walls makes this cup stand out in quality among cheap novelty mugs. SAY IT WITH COFFEE - The unique design is printed on both sides with long-lasting vivid white print that will pop out when the cup is filled. THE PERFECT GIFT - Great for any coffee lover, for any occasion! Makes a great gift for coworkers, family, and friends - for Christmas, Birthday, or just because.