New Martin Dozen (12) Adult 3 Pocket Football Baseball Wrist Coach Coaches Black Keep Track of Plays Great for Baseball, and Football Quarterbacks Sizing Adult for ages 12/13 years old and older Adult Actual Size: 4"x 6" Adult Actual Size of Window Opening: 2 15/16" x 4 3/4" Youth for ages 11/12 years old and younger Youth Actual Size: 3 1/2" x 5" Youth Actual Size of Window Opening: 2 1/2" x 4 1/8"