1 15/32" O.R. x 1 5/16" I.R. x 90 degrees x 63/64" thick N42 Neodymium Arc Magnet | Arc Segment from First4magnets.com
8pcs Arc Magnets Or8.5xir2.5xt6mm X 90° Angle N38h Magnetic Segment Radially Magnetized Neodymium Magnets Motor Use Nickle Coat - Magnetic Materials - AliExpress