Approximately 18x10x6mm silver plated Britannia pewter TierraCast® classic necklace bails, 1-2mm loop. Silver plate is a thin surface layer of actual silver. Necklace bails make adding a jewelry focal to your cord easy. Fits up to 6mm cord and chain. This style does not open – slide over necklace and use a jump ring to attach pendant. Measurements include loops. TierraCast Safety Compliance.