https://www.couragemagnet.com/multipole-ferrite-ring-magnet/3538.html
Injection-molded ferrite magnetic rotor with helical impeller
This is a 32.6mm outer diameter injection-molded ferrite magnetic rotor, entirely black in color with spiral blades. The total height is 15.4mm, featuring a...
injection moldedmagnetic rotorferritehelicalimpeller