Package contents: there are 10 pieces locking magnetic jewelry clasps, and each locking magnetic clasp has a ball in the middle, the enough quantity can meet your needs to extend your bracelets and necklaces and other applications Size information: the diameter of the copper ball is approx. 8 mm/ 0.3 inch, and the total length is about 35 mm/ 1.38 inch, the proper size fits most necklaces and bracelets, and the round magnetic necklace clasps will not take up much space Easy to use: our magnetic clasps have a lobster clasp at each end of the chain, which is easy to install or take off, you can use the round locking clasps to extend the length of your bracelets and necklaces, it is easy to operate DIY for jewelry making: the lobster clasps can be applied to adjust your bracelets and necklaces; Additionally, you can combine the lobster clasps with other accessories to make personalized decorations according to your preference Sturdy material quality: our jewelry magnetic clasps are made of copper material, copper material can not be corroded easily and has a smooth surface and bright color, hard to be scratched and can keep for a long time