From Amazon
Kärcher Stone roller set for all Kärcher FC and EWM 2 (2-part, washable, lint-free, machine washable at 60 °C, for hard-wearing hard floors, stone, ceramics)
Carpet Cleaners
Karcher FC3 & FC5 Replacement Rollers (Stone Floor)
Conrad Electronic
Kaercher Home & Garden Kaercher 2.055-021.0 Brushroller