Check the listing for details. Nautilus / Bowflex 552 Series 2 Disc 2,3,4,5 Replacement ***Complete Set***. Color: Black, Condition: New. Listed at 14.75 USD. Nautilus / Bowflex 552 Series 2 Disc 2,3,4,5 Replacement ***Complete Set***. You get all four disc with one purchase! These replacement disc’s are 3D printed and made from a high quality durable material called PETG. It’s NOT made from the very brittle PLA plastic that other eBay sellers are selling. PLA plastic will crack and separate with little force rendering it useless. I only use Prusa filament which is a top quality brand. Disc colors will usually be black but sometimes a dark gray depending on the filament colors I have on hand. This item is for all four replacement disc (2,3,4,5) *****THESE ONLY WORK ON THE SERIES 2, SERIES 2 HAVE WHITE NUMBERS ON THE OUTSIDE WEIGHT DIAL. SERIES 1 HAVE RED NUMBERS ON THE OUTSIDE WEIGHT DIAL*****