Dimensions: 40mm OD x 20 mm ID x 10mm thick, Magnetic Face; 40mm diameter, Magnets Type; Neodymium, Material: NdFeB, Magnetization Direction: Axialradial(Poles on Flat Ends), This magnet is a very very strong and sturdy neodymium ring magnet Circular. Disc Magnets can be fixed in place using adhesive or can be pushed into circular drilled holes in wood or plastic, many new packaging designs use Neodymium magnets cleverly trapped behind lamination of cardboard to provide invisible closing mechanisms for folders, gift boxes, name badges and even greetings cards than stick to your refrigerator!

Dimensions: 40mm OD x 20 mm ID x 10mm thick, Magnetic Face; 40mm diameter, Magnets Type; Neodymium, Material: NdFeB, Magnetization Direction: Axialradial(Poles on Flat Ends), This magnet is a very very strong and sturdy neodymium ring magnet Circular. Disc Magnets can be fixed in place using adhesive or can be pushed into circular drilled holes in wood or plastic, many new packaging designs use Neodymium magnets cleverly trapped behind lamination of cardboard to provide invisible closing mechanisms for folders, gift boxes, name badges and even greetings cards than stick to your refrigerator!