The Rocking Glass is a sturdy and fun glass that you can use for almost everything. It has a specially designed curved bottom, which allows the glass to tilt back and forth without the content spilling. The rounded bottom also makes it comfortable to hold in the hand as you can both grip around the bottom or cradle it in your hand like a sphere. Rocking Glass is a great conversation piece and is a fresh take on a traditional tumbler. The glass is designed to be robust enough to hold both cool and hot drinks. Use it for cocktails or as a decorative accessory. Or, do like they do at the MoMA cafin New York: use it for that extra tasty dessert. Materials: Glass Size and Weight: H: 8 x: 9 cm Product Information: Curved bottom allows the glass to tilt without spilling the content. Suitable for both cold and hot content.