Made of metal material, features a domed cover metal pin. Decorative nail heads, also called upholstery tacks, are used to fasten upholstery material to furniture or directly used into the leather sofa for trim. These thumb tacks are perfect to secure paper items or photos onto the cork board. Ideal for hanging or holding down charts, banners, calendars and much more. Thumbtacks have unlimited uses around the house and schools.