Package: total 50 pieces mixed color luminous necklace cords, 5 colors, you can make your own jewelry, add pendants, beads, charms to make your unique chain. Adjustable Size: Each necklace cord measures 2mm in diameter, 45cm/18in in length. It also comes with a lobster clasp and a 5cm/2in extension chain. You can adjust the length according to your needs. DIY Jewelry Findings: The necklace cord allows you to create necklaces, bracelets, and more for your friends or family as handmade gifts for birthdays, anniversaries, etc. DURABLE USE: Made of waxed cotton, a durable and lightweight material, these cords are comfortable to wear for a long time without fading or tarnishing. You can make the beautiful gift for your loved ones. Very Meaningful Homemade Gift: With necklace cords, you can make necklaces, bracelets, and other jewelry for your friends or family as a handmade gift and surprise them on birthdays or anniversaries. This is very meaningful.