Color: white. Measures about 1-1/2 inches in diameter, and with the axle clipped to it, it's about an inch wide.

Genuine Frigidaire part. 

Part Number 5300809640 (AP2135554) replaces 154174501, 154174502, 154294801, 3202777, 612977, AH452448, EA452448, PS452448.