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Pololu - 1524
They are 2 mm thick with a 9.7 mm diameter, and the hole through the center enables them to securely press-fit onto the 1.5mm-diameter motor shafts of mini plastic gearmotors (extended motor shaft versions only). The disc consists of six evenly spaced magnetic poles (three north-south pairs), which allows for an encoder system that offers 12 counts per revolution.