925 Sterling Silver 4.5mm Magnetic Clasp 10 sets(10 clasps/20 pieces) This is Jewelry Findings: component parts and pieces used in making jewelry. Using a magnetic clasp when making jewelry requires other jewelry findings and tools. It can be use with jump rings or split rings strung through the loop in each side of the clasp or tying cord directly to the clasp to attach to a necklace or bracelet on your own personal preference. Always open jewelry by holding the clasp directly, instead of tugging the cord. Style and Size : 4.5mm Magnetic Clasp (w/925 Stamp) Materials : 925 Solid Sterling Silver Quantity : 10 Sets(10 clasps/20 pieces) WARNING: Magnetic fields can affect the function of pacemakers or other implanted electronic medical devices. Contains small magnets. Swallowed or inhaled magnets can attract through and squeeze intestines or other body tissue, causing serious injury or death. Seek immediate medical attention if swallowed or inhaled.