Your regular paddles won't survive half as long against these Extra Heavy Duty Polyurethane paddles.

Razor's Edge Rotor
Polyurethane is designed to outlast rubber by a factor of four, and it achieves it with flying colors by maintaining its cutting edge as it wears.

Specifications for the Paddle
 
Polyurethane, as compared to rubber, is more durable.
Designed to last four times as long as OEM paddles while retaining a sharp cleaning edge for consistently effective sweeping down to the pavement.
Suitable for the following Toro models: CCR2000, CCR2450, CCR3600, and CCR3650; PowerClear 210R, 221QR, and 421QR