I've moved out of my parents' house. There are 8 colors. They are bundled in pairs, but can be separated into individual strands. I measured the length of one strand roughly. It was about 5 meters. The rest are the same weight (about 150g), so I'm estimating. I apologize if it's incorrect. I don't know the material inside. At first, they were very dusty and black. I only wiped them in a loop. Dust still remains. Your hands will get very dirty. The close-up image of the yellow shows how much dust is left. They are lightly secured with masking tape. Would you like them for crafting? Regarding shipping: I take them to the post office once a week (usually on Saturdays). Depending on when you purchase, you may have to wait more than a week for delivery. If you're in a hurry, please consult with me. Please confirm in the comments before purchasing if I can accommodate your request.