Magnetic Clasps are great for people who have long nails, arthritic or otherwise have difficulty using the regular jewelry clasps. That is if they do what they promise; not lose your necklaces, turn your neck green or cause allergies. These clasps are Sterling Silver Made in Italy, utilizing the very powerful Neodymium N50 Super Magnets which are crimped in place and wont pop out, wont turn your skin green, and lasts so long it will end up costing you much less than the cheap stuff. What makes these especially great is that they can be attached (or detached) to just about any necklace quickly and easily. The only word of caution is that, the heat from boiling water (150F or above) will diminish the strength of the magnets, so its best to detach them before cleaning your jewelry in ultrasonic cleaners. This Clasp is the middle size of the 5 sizes we carry.