The American species of maple are divided into two groups: Hard maple, which includes sugar and black maple; and soft maple, which includes red and silver maple. Until the turn of the century, the heels of women's shoes were made from maple, as were airplane propellers in the 1920s. Maple has been a favorite of American furniture makers since early Colonial days. Hard maple is the standard maple for cutting boards because it imparts no taste to food and holds up well. Cream to light reddish-brown. Usually straight-grained and sometimes found with highly figured bird's-eye or burl grain. Bird's-eye resembles small circular or elliptical figures. Clusters of round curls are known as burl. Heavy, hard, strong, tough, stiff, close-grained and possesses a uniform texture. Maple has excellent resistance to abrasion and indentation, making it ideal flooring as well as cutting boards and countertops. Takes stain satisfactorily and polishes well.