Lotus Connect Store › Magnetic Rotor, 20x8 mm Image 1 of 1 Magnetic Rotor, 20x8 mm $7.67 PTFE coated Alnico magnet rotors and needles. PTFE coated Alnico magnet rotors and needles. Size 20x8mm, Centre ring Quantity: Add To Cart Added! PTFE coated Alnico magnet rotors and needles. PTFE coated Alnico magnet rotors and needles. Size 20x8mm, Centre ring