This type of brush washer is described as of 'gong' shape, or tangluo xi, as it has a very compressed body. It belongs to a group of eight vessel shapes referred to as the ba da ma, 'Eight Great Numbers', all of which are covered in a peachbloom glaze. Two Kangxi-marked brush washers of this type were sold in these rooms, 19 March 2008, lot 636, and 15 September 2009, lot 445.