A diameter of 30 mm is actually an absurd size for sphere magnets - each sphere has an adhesive force of over 13 kg! Ask a woman to separate two of them by hand; not many will succeed. And then you hand the spheres to a grinning guy and watch how his facial expression will change from bewildered to tense ...
Such a large sphere magnet is not really useful, unless you can think of something! In that case, we look forward to hearing from you.
Thanks to a slightly thicker coating, chrome-plated magnets are better protected against abrasion than nickel-plated magnets. But, as with all large sphere magnets, the surface coating will not last forever, since the point-shaped contact areas are subjected to enormous forces. These magnetic spheres will be delivered individually packaged in a clear plastic tube.