This Necklace is 18-20". It is made of Stainless steel and has a magnetic closure. Thank you for your interest in Piccadilly’s Jewelry! Below is some info about our line and how we process your order. Piccadilly's packaging: You order will arrive on a Piccadilly jewelry card or hang tag, depending on the item. If you would prefer to eliminate the packaging, please send me a message and I will send each item in an individual biodegradable envelope to keep items organized and to decrease the use of plastics. -Jewelry boxes: I believe these boxes elevate our products & will increase your sale price by at least 20%. My desire it to increase my sales by increasing yours, so I offer all of my gift boxes at cost, and make no profit from them. You can find the boxes under Gift Boxes on my Faire site -All Piccadilly Jewelry is Nickel, Lead & Cadmium Free & Hypo Allergenic.