A popular Japanese tea cup shape called a yunomi. Soft undulating grooves on the side allows fingers to comfortably handle the cup. This is porcelain, wood fired to cone10+ with a reduction atomosphere and a natural ash glaze. Like many handmade pieces in natural firings, this is unique and while you can try to produce the same one, they will only have a "family resemblance".
 
Width x Height: 3.3"x3.8"
Weight:0.58