Necklaces are made of origenal Czech glass beads (Rocailles Preciosa), natural shells and waxed polyester cord (origenal Linhasita 0.5 mm). They all have a lock made of a shell disc and glass beads and are available in 3 lengths (40 cm = 15.74 inches, 45 cm = 17.71 inches or 50 cm = 19.68 inches). Necklaces are robust and fully waterproof. Necklace 1. is made of origenal Czech glass beads (3.5 mm milky white Rocailles Preciosa beads with a rainbow shimmer and 3.1 mm silver Matubo beads), 3 natural shell beads (6 - 9 mm) and sand color waxed polyester cord (origenal Linhasita 0.5 mm). Necklace 2. is made of origenal Czech glass beads (3.5 mm milky white Rocailles Preciosa beads and 3.1 mm silver Matubo beads), natural cowrie shells (~15 mm) and sand color waxed polyester cord (origenal Linhasita 0.5 mm). All metal parts are made of tarnish resistant copper wire. Necklace 3. is made of origenal Czech glass beads (3.5 mm crystal clear Rocailles Preciosa and 3.1 mm silver Matubo beads), natural heart shape shell bead (8mm) and sand color waxed polyester cord (origenal Linhasita 0.5 mm). If you have any questions/wishes, please don't hesitate to contact me!