These twe shots were made at the besalèn of the Solonese gamelan maker Pak Tentrem. (A besalèn (Javanese) is a smithy, perapèn in Indonesian.)
The round object in the center is a kempul, i.e. a small (about 50 cm) hanging gong, with a boss in the center. Here you see how the boss is being hammered out, the last phase before the kempul is thrown in cooling water, the slug scraped off and polished.
In the back one can see another fire in which a wilah demung is being produced, heated and hammered alternatively. A wilah is a (bronze or iron) key of a metallophone with usually six or seven keys. The demung is a large and low-tumed metallophone.
(1) 5D3 with 24-105 mm (kit) lens, 1/20 sec. at F6,3 ISO12800
(2) The same, 1/15 sec. at 6,3 ISI 12800