18k gold plated chain and charms, which makes for a great quality necklace but you know the rules, keep it dry to maintain its shine! 
Necklace is approximately 17.5inches with 2inch extender to be maximum 19.5inches. These necklaces are complete customizable, please reach out if you want a specific length! 
Please read: If you’re sensitive to weight on your neck, this necklace has a little bit more weight than a normal necklace because of the added charms.