The Starbucks 2017 Crown Anniversary Siren Crystal Ceramic Tumbler Traveler Mug is a 10oz mug featuring a multi-color design with a coffee and tea theme. This collectible Starbucks tumbler has a unique siren crystal ceramic exterior, making it a desirable item for coffee and tea enthusiasts and collectors. Perfect for on-the-go use or as a decorative piece for those who appreciate the Starbucks brand.