Empty cores from rolled rubber mats. They are sturdy, but some have dents as shown in the image. They are not needed, so I will ship them for a packing fee of 1,500 yen, with the shipping cost to be paid by the recipient. Hand-off is also OK, and free. Size: 91.5cm x 8.5cm, cardboard thickness is 6mm. There are 15 of them.