Product Name: Gunsei Rock Glass Material: Soda Glass Weight: Approximately 240 g Capacity: Approximately 300 ml (when full) Size: [Height: Approximately 8.8 cm, Diameter: Approximately 7.7 cm, Base Width: Approximately 7.2 cm] Production Area: Okinawa (Made in Japan) "About Ryukyu Glass Products" Our Ryukyu glass products are handmade, with one blue and one water glass set. There are individual differences in size and weight, and the values listed are averages. The photos on the product page are examples, and the colors and the way bubbles appear may differ from the photos. Also, because they are handmade, there may be slight distortions in some products, but we hope you enjoy them as the unique charm of handmade items. The colors may appear slightly different depending on your monitor. Please be aware of this. "Usage Precautions" Since this is not heat-resistant glass or tempered glass, sudden temperature changes may cause it to break. Do not use in dishwashers or microwave ovens. Please also refrain from using it for hot water drinks, washing with hot water, or cooling in the freezer.