Combination photo taken on Aug. 9, 2018 shows the weight of a key (15 grams) (upper) and the weight of a tea cup (14.5 grams) made by the "Kuaixueshiqing" studio in Jingdezhen City, east China's Jiangxi Province. Established in 2010, the "Kuaixueshiqing" studio consists of porcelain craftsmen with different skills, and is dedicated to the innovation of traditional porcelain craft. (Xinhua/Pan Siwei)