An incomplex shape is preferred, while unembellished vessels of either bronze, earthenware, porcelain, or jade are all considered appropriate.
黃永川透露了一個簡單的量法：花器最高或盤之最寬，最好不超過中指與拇指之間最大開度；最小最窄，則不小於拇指與食指間最大開度。