Made of acrylic with stainless steel, hypoallergenic chain and 18k gold plated 304 stainless steel lobster closures clasp. Necklace Length: 10.5 inches; 11 inches with extension. Total necklace chain length is 19 inches -21 inches.  Each design of the necklace is unique and cannot be exactly replicated. Extremely light and comfortable to wear. Slight variation may occur compared to the pictures as they are handmade items.