Amazon.com: Grade 8 Ceramic Ring Donut Magnet for Crafts,OD 60 mm x ID 32mm x 15 mm,Ferrite Ring Magnet with Hole for Hobbies,Science Projects,School,DIY(2 Pack) : Industrial & Scientific
Ceramic Ring Magnets | Ceramic Magnets
Amazon.com: Heavy Duty Magnets 1 7/8" X 7/8" X 3/8" Square Magnet, Grade 8 Ferrite Blocks Ceramic Magnets Strong for Crafts, Science and Hobbies (Pack of 10) : Industrial & Scientific
JENSEN C8R 25 W 8 Ohm
Burnur Grade 8 Ceramic Ring Magnets Diameter 45mm x 22mm x 8mm (Pack of 6) : Amazon.de: Business, Industry & Science