Made of metal material, features domed cover metal pin. Decorative nail heads, also called tacks or clavos, are used to fasten material to funiture or directly used into leather sofa for trim. These thumb tacks are perfect to secure paper items or photos onto the the cork board without causing any . Ideal for hanging or holding down charts, banners, calendars and much more. Thumb tacks have unlimited uses around home, office and school.