The Hollow Door Knocker Hoop combines bold, modern design with an ultra-lightweight feel, offering a statement look you can wear comfortably all day. 18K Plated Sterling Silver / .925 Sterling Silver Post back closure Diameter: 25 mm Drop: 1.5" Jewelry Care: Clean metal jewelry with a soft cloth and mild soapy water. Avoid abrasive cleaners, steamers, or ultrasonic machines. Dry thoroughly and store dry place.