New, metal studs, rivets, screw-on type, approximately 1cm long x 7mm diameter, set of 20. Set of 20 screw-on cone-type studs. The size is approximately 1cm in length and 7mm in diameter. Since they are screw-on, there is no risk of the back prongs catching on the inner material. Although only 10 studs are shown in the photo, a set of 20 will be shipped. We are selling sets of 10, 20, and 30, so please choose according to your needs. Shipping method: We plan to use Yu-Pack Mini Letter (handled as regular mail, please understand that this shipping method does not include tracking or insurance). If you wish to use Click Post shipping with tracking, there will be an additional charge of 110 yen, and we will provide a separate listing for you, so please let us know before purchasing. If you have any questions, please feel free to ask in the comment section. We strive for prompt and courteous transactions. Thank you.