Amazon.com: Ferrite Ring Magnets with Holes - 1.26 Inch (32mm) Round Disc Donut Magnets for Refrigerator Fridge, Science Projects, Crafts, Around The Office (Pack of 40) : Industrial & Scientific
100mm O.D x 50mm I.D x 12mm thick Y30BH Ferrite Ring Magnet - 9kg Pull
74mm O.D x 40mm I.D x 15mm thick Y30BH Ferrite Ring Magnet - 7kg Pull
SrO OR BaO and Fe2o3 Ferrite Ring Magnet, N35-N55
Ceramic Ring Magnet | Ceramic Magnets
72mm O.D x 30mm I.D x 12mm thick Y30BH Ferrite Ring Magnet - 6.4kg Pull
155 x 60 x 20mm Ferrite Ring Magnets - Pack of 2/3/5 - Magneticks
Ferrite ring magnets D 100/57 mm, H 20 mm, Ferit, Y30 - SOLLAU s.r.o.
Ferrite Anisotropic Ring Magnets | Ring Magnets | Magnets 4 U
Ceramic Ferrite Ring Magnet Ø100mm x 60mm x 17mm | Magnetic Solutions | Industrial Magnets | Neodymium Magnets