Not very sturdy. They are very expensive but not very high-quality.

These are awesome! They are great s as nd will probably buy more so i can have on all my necklaces. Smooth and comfortable on neck. Great product for those with long nails or for people with hand dexterity issues.

There is no way for me to attack a clasp. They are too heavy for a delicate gold chain. These are not super strong magnets.