Magnet Button Size 18x18mm Approx.Qty-20 Sets. Material : Iron with Nickle Polish. The magnet buttons securely when it is closed. It's also easy if you want to open it .Used For Making : DIY Crafts. These magnetic buttons great for sewing and crafting, purse, tote, wallet, bag, handbag, travel bag, clothing, jacket, covers, scrapbook, etc. Magnetic snap fastener are made of high quality metal which is durable, lightweight and rust free.