Steel wires to attach your hanging bar or display boards to the hanging buttons. Extending wires with there spring style find there own natural level. Nylon extending wires are only 93mm long but you can unwind the joined nylon to up to 1.5meters. "C", "S" and double end hooks are also so popular for hanging displays or joining display boards together. Double ended hooks also available in other lengths upto 40” (1020mm)