Long thin 20mm x 4mm x 2mm neodymium block magnets N52 (2-5 pcs) DIY Scalextric
Samarium Cobalt. N52 is the highest grade which is currently widely and reliably available. Neodymium N52 - High Grade. Grade: N52. Neodymium Blocks. Neodymium Disks / Rods. Neodymium Cubes. Neodymium Rings.