Thank you for viewing! This item was purchased some time ago and I really liked it, but I haven't used it and it's been stored away. I'd like to sell it to someone who will appreciate it. It's a set of 2. This mug has a double-walled cup, and the inside is hollow, making it lightweight and heat-retaining. It seems like there are some small ball-shaped objects inside the hollow space. When you tilt it, it makes a cute bell-like sound. I haven't used it, but I wonder if it would sound different when there's a drink in it. This is a discontinued product and I think it's a very rare item. Diameter (cup part): 8.7cm Width (cup + handle): 12cm Height: 11.5cm Please refrain from purchasing if you are concerned as it has been stored at home. For those who love cute mugs, how about a pair? Color: White Type: Mug Material: Lacquerware Size: Small (Diameter: ~ 17.9cm) Shape: Round #many #cup #mug #cute #rare #Ethical life #pair New, unused Glass/Cup/Wine Glass: Pair (2), Mug