Brew yourself the most delicious cup of coffee or tea with your new Robusta clear coffee mugs from Libbey! Libbey is a brand of quality that’s been around for 200 years! Always know how much is in your cup with a crystal-clear mug. Hold the mug with a cool comfortable handle. These mugs are durable and long lasting and can be cared for by hand or by dishwashing. Color: Clear. Size: 13 Ounces.