This is a set of 3 colors of silk thread and 3 colors of foil thread. 3 colors of silk thread weigh 160 grams. Silk thread (dyed raw silk, 21 denier, 24 ply, loosely twisted) 3 colors of foil thread, 9 pieces total. Foil thread is made of polyester and non-specified fiber (paper). It will break if pulled too hard. Handle gently for best results. Each piece is approximately 900 meters. Please check the image for the thickness of the silk and foil threads. Thank you very much.