RoRo 4" Handmade Ceramic Glass from Kaolin Clay with unfinished underside and Mottled Blue Glaze 100% handmade from kaolin clay from Lampang Province, Thailand Un-glazed on outer bottom for an elegant and simple finish Includes 4 glasses with dimensions 3.5"h x 3.5"wide with slight tapering at bottom Microwave, Oven, and Dishwasher Safe Comes Boxed in a Set of 4 to be gift friendly