Although it is new and unopened, it has been stored at home for a long period of time, so the product condition is listed as "like new." The core material is made of styrofoam. Two sets of 5 pieces each, with a diameter of 20mm x 100mm... White Shin-Bay with a diameter of 20mm, ideal for extrusion molding. The cheapest shipping method will be used with simple packaging. Please feel free to comment if you have any questions. Thank you.