This is "Lumiyarn" metallic yarn from Oike Tech Co., Ltd. Made in Japan. For crochet, a crochet hook size of 3-7 is recommended. Please use it twisted together with another yarn as this yarn alone does not have sufficient strength. Regarding shipping, please note that we will use recycled cardboard boxes and paper bags for packaging. ★To prevent any trouble, we kindly ask that those who are overly sensitive refrain from bidding!! Please note that we cannot ship on Saturdays and Sundays. We are working regular hours, so we may not be able to respond immediately.