Small size, 40 pieces of copper relief art materials. - Brand: DAIKAN CO., LTD. - Material: Copper - Quantity: 40 sheets - Size: Small - Patent: PAT.P - Application: Relief art creation I've had these for a while for use in workshops. The box is unopened, so I can't see inside, but I think there is some aging. I will sell them under these conditions. Since they are for educational materials, I think it is possible for children to easily create copper plate reliefs. As they are used in school educational materials, it is preferable that they are used by experienced individuals. Thank you for looking.