this gong is of a heavier weight than the other chao gong that we sell of the same size. better quality with an even richer sound. gong beater is included for free. we recommend that you also order a gong bag for safe transportation and storage. please note: these gongs can have small 'blisters' on their surface this cannot be 100% avoided for handmade gongs. It is a normal phenomena it is not a hole or a dent it is a bubble of the melten copper and does not affect the sound or lifespan of the gong. chao gong the chao gong is made of electrolytic copper and tin. It is almost flat except for the rim which is turned up to make a shallow cylinder. On a 10 (25 cm) gong for example the rim extends to about half an inch perpendicular to the gong surface. The main surface is slightly concave when viewed from the direction in which the rim is turned. The centre spot and the rim of a chao gong are left coated on both sides with the black copper oxide that forms during the manufacture of the gong. The rest of the gong is polished to remove this coating. the earliest chao gong is from a tomb discovered at the guixian site in the guangxi zhuang autonomous region of china. It dates back to the early western han dynasty. They were known for their very intense and spiritual drumming in rituals and tribal meetings. traditionally chao gongs were used to clear the way for important officials and processions much like a police siren today. Sometimes the number of strokes on the gong was used to indicate the seniority of the official. In this way two officials meeting unexpectedly on the road would know before the meeting which of them should bow down before the other.