A roller brush (310, 310a, 310b) for a cleaning appliance (100) that includes a brush core (314) defining a longitudinal axis of rotation (X A , X B ) and three or more dual rows (325) of bristles (318, 320, 330) disposed on and equidistantly spaced along a circumference the brush core. Each dual row of bristles includes a first bristle row (325a) of a first bristle composition and having a first height (L B , L B1 ) and a second bristle row (325b) of a second bristle composition stiffer than the first bristle composition and having a second height (L B , LB 2 ). The second bristle row is circumferentially spaced from the first bristle row by a gap (D C ) less than or equal to 10% of the first height. Also, the first height is less than or equal to 90% of the second height.