Lotus Connect Store › Magnetic Rotor, 30x8 mm Image 1 of 1 Magnetic Rotor, 30x8 mm $7.06 PTFE coated Alnico magnet rotors and needles. Length 30 mm, Dia. 8 mm, Center Ring Quantity: Add To Cart Added! PTFE coated Alnico magnet rotors and needles. Length 30 mm, Dia. 8 mm, Center Ring