It is made of copper. 1 frame per frame is alternately connected vertically and sideways. Because the frame is small and small, it becomes delicate finish. Can be passed through pins and pins up to 0.7 mm in diameter. Please be sure to use this product by spreading the chain of the chain at the time of use. * the shape and size of the frame may vary depending on the lot. Please understand beforehand. * this product has a weighing of 1m and 50m (Lille roll). The 50m (Lille roll) contains the domestic employment charge in the price. In addition, there may be a joint connected by wire in one place. Please understand beforehand.