DOBANI Chao Gong, 10-Inch (25cm), with Beater GMMB9 Gong beater made from solid mulberry and dense foam wrapped by nylon. It is approximately 1 1/4" x 9" It is made of a bronze alloy which is roughly 80 percent copper and 20 percent tin Center spot and outside rim retain the black copper oxide that forms when the gong is made On the rest of the gong this coating is removed and the surface is polished