6 colors of silk thread (dyed from raw silk 21-count 4-ply). These are thin threads. I am using them as the weft for a sash. Due to circumstances, please use them by combining 2 or 3 threads together. The thread spools are made of plastic. The silk thread, including the spools, weighs a total of 755 grams. The spools are estimated to weigh an average of 100 grams each, with 6 spools in total, making approximately 600 grams. The silk thread itself is estimated to be around 155 grams. The plastic thread spools are old (they have scratches, dirt, scuffs, and writing in marker).