Gradations of hardness produce creative tonal colors. Black birch handle. Choose by number key: (1) black rubber extra soft ball, (2) tan rubber soft ball, (3) brown rubber medium soft ball, (4) light green rubber medium ball, (5) dark green rubber medium hard ball, (6) grey rubber hard ball, (7) 1-1/4" maple hard ball, (8) 7/8" rosewood hard ball, (8A) 1-1/4" rosewood hard ball, (9) 5/8" brass hard ball, (9A) aluminum medium hard ball, (10) 1-1/8" phenolic extra-hard ball, or (10A) 7/8" phenolic hard ball.