Our Jeffy Rivets are made of solid brass (SB), or solid brass with a nickle plate (NSB). They come in several lengths to suit hundreds of applications for leather crafting and leather working. Jeffy Rivets also come in two different cap Styles. The Single cap style has an eyelet that is open and visible on the underside of the post. The Double Cap Style adds a finished appearance to both sides by adding a cap to match the top.