These are small earth magnets . Composed of Neodymium/Iron/Boron (NdFeB), these magnets are strong and make for a great way to attach tools to a metal workbench, hold small children to a fridge, and as a trigger for reed switches. 

Features

• Dimensions:  40 x 14x 10 mm
• Material: NdFeB
• Grade : N52
• Plating/Coating: Ni-Cu-Ni (Nickel)
• Magnetization Direction: Axial (Poles on Flat Ends)