These sphere magnets are made of neodymium magnets, or NdFeB magnets also called Super Powerful Magnets.

Grade: NdFeB magnets, 42
Rating: 13,200 Gauss
Plating: Ni+Cu+Ni 3 layer plated, the best coating available.

About Neodymium Magnets:

Neodymium magnets are one of rare earth permanent magnets. Neodymium magnets are also known as NdFeB magnets, or neo rare earth magnets. Since it's very strong, people also simply call it super strong magnets or super powerful magnets. The major elements of this magnet include neodymium (Nd), iron (Fe) and boron (B), or NdFeB.

About magnet4sale.com: magnet4sale.com is the online store of the CMS Magnetics Inc., which has been supplying permanent magnets to North American industries since 1999. CMS Magnetics carries all types and sizes of permanent magnets, including: neodymium magnets, ceramic magnets, SmCo magnets, AlniCo magnets, and flexible magnets. CMS also carries magnetic assemblies and tools like: magnetic cup holders, industrial magnetic lifters, magnetic sweepers, magnetic brooms, magnetic hooks, fuel magnets, water magnets, badge magnets, etc.