N52 Ndfeb Block 30x30x20 Mm Super Strong Neodymium Permanent Magnets Water Meter Filter Industry Magnet Nicuni Coated - Magnetic Materials - AliExpress
30 x 20 x 10 / N38 - NdFeB (neodymium) magnet
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Pololu - Magnetic Encoder Pair Kit for 20D mm Metal Gearmotors, 20 CPR, 2.7-18V