A Zamac Caps is a metal closure made from Zamac alloy — basically a mix of zinc, aluminum, magnesium, and copper. It gives the bottle real weight and that cool, solid metallic feel plastic can never copy. Our Luxury Custom 15mm Zamac Magnetic Round Perfume Bottle Cap adds a strong built-in magnet that snaps shut with a satisfying click every single time. It’s 15mm round, fits standard perfume necks perfectly, and we can customize the shape, color, logo, and finish to match whatever story your brand is telling.