Barrel clasps are a great design element to complete and close your bracelet or necklace securely and stylishly. Each end of the barrel in these clasps is magnetized, making latching easy.Details: Available in multiple color finishes 10mm clasp size 4 clasps Nickel free Aluminum WARNING: Magnets can cause medical devices to malfunction. Individuals with internal pacemakers, internal defibrillators and insulin pumps should avoid items containing magnets or magnet closures.