19mm x 11mm. Excellent quality – secure hold, but doesn't stick. This magnetic clasp is made from solid brass and electroplated lead and nickel free. Industry-leading manufacturing techniques are used to ensure the plating will never affect anyone's skin. Made from brass. Nickel-free hypoallergenic. 100% lead-safe. Protective e-coating layer. Care Tips: Do not swim or bathe with this jewelry. Try not to spray perfume or rub lotions on this product as it could mar the finish. To clean, use gentle hand soap and warm water. Pat dry with a paper towel. Do not use jewelry cleaners or a jewelers cloth.