Grade N52 neodymium rare earth cylinder magnets are used in this product. A 5/16" (8mm) N52 neodymium cylinder magnet powers either side of the pair. A machined brass carrier accepts a split ring on each side and presses them into it. The item has a diameter of 3/8" (9.5mm) and a length of 1.25" (not including the rings).
The following are only a few examples: