The kerosang rantai/kerongsang brooch is a set of 3 brooches used by the Peranakan Straits Chinese ‘Nyonyas’ to fasten kebaya/baju panjang. Kebaya top has no button. Kerosang consists of three identical shapes and designs connected with chains. 
 
Motif: dragonfly

Each kerosang measure about 1.8 x 5.4cm
Each link chain measures approx 11cm long.