Rubbermaid microfiber mop refill.
Green, Blue
18 in, 24 in, 36 in, 48 in
Green: RM-FGQ41200GR00; RM-FGQ42400GR00; RM-FGQ43600GR00; RM-FGQ44800GR00, Blue: RM-FGQ41200B00; FGQ42400B00; RM-FGQ43600B00: RM-FGQ44800B00