Magnetic Levitation Kit 2 Pieces 1 ea OD115 X ID45 X 20mm & 1 ea Small Ring Magnet
This ring magnet is made of C8 ceramic magnetic material and axially magnetized. The magnet is mostly used as speaker magnets but also used for various projects. Ceramic magnet is also known as hard ferrite magnet. This magnet does not have coating.
One project to use this magnet is for Magnetic Levitation DIY as Mr Mikhalchuk did in the following video.
RTFMs Episode #8: How to Build a Magnetic Levitating Top.
The top magnet part no is CR8-002