Jewelry Findings: Rubber (natural rubber, non-allergenic) necklace, thin to suspend that casual elegant pendant, 2.0mm thick, 18 in long. End caps and clasp are goldplated, nickel free. Will slip though many bead holes. If not, cut end cap off, thread beads on chain and then use our item F-EC-GP-20, End Caps, Gold Plated, 2.0mm to secure (crimp, cement or solder).