Hard maple, compensated, 3-foot design. Maximum height of 1/2" at bass side, minimum height of 7/16" at treble side for optimum clearance of wound and plain strings. Well-made replacement bridge for banjo-mandolin, approx. 1-7/16" string spacing (center of 1st pair to center of 4th pair). Feet thick enough to allow sanding for fine height adjustment.