The cylindrical and round shaped ceramic magnets are not called as ceramic cylinder(rod) magnets,they are not as strong as neodymium magnet rod, but they are less expensive hand have excellent resistance to demagnetization.
Ceramic Cylinder Magnets Are Sometimes Preferred Over Neodymium Cylinder Magnets
Although ferrite（ceramic）cylinder/rod magnets are rather brittle,they possess good resistance to corrosion and can be used in high temperatures. When looking for a cost effective alternative with good demagnetization resistance, the ceramic cylinder magnets are preferred over neodymium cylinder magnets. Cylindrical ferrite(ceramic) magnets are used in motors, water conditioning and reed switches. Ceramic /ferrite magnets suppress high frequency noise in electronic circuits. This makes them ideal for speakers and car audio systems.