Stackable Pair. Rust Interior. Holds 8 oz Get a Grip on your bevvies, people! All Gettagrip pieces are shaped with thumb or finger grooves or resting spots for klutz-friendly hold & hand warming comfort. Smooth, porous exterior warms hands without burning, and is safe to use with both hot and cold items. Unglazed clay sealed against mold & mildew by food-safe Liquid Quartz application. Knucklebones are extra durable, earth sustainable, look & feel great in your hand, & compliment every home’s aesthetic. Trust me. For coffee, wine, whisk(e)y, juice, water, etc. All pieces are thrown on potters wheel, carved, & hand-built by me. Glazes dipped, sprayed, & hand-painted in my home studio in Savannah, GA. No two pieces are identical VOLUME: 8 oz tumblers (2) MATERIAL: Stoneware with black Porcelain Grog CARE: Microwave & dishwasher safe; handwashing recommended ABOUT THE KNUCKLEBONES SPECKLED CLAY LINE Made from a hand-mixed blend of stoneware with porcelain black grog, a formula created, pounded, and blended by the artist, with sustainability & family budgets in mind. Unglazed clay exteriors are sealed against mold & mildew by food-safe Liquid Quartz application Knucklebones designs are extra durable for survival in the wild, compliment every home's aesthetic, & feel great in your hands. Trust me!