We offer 3 families of metal wood heads that change in 2 key ways: Weight/Volume – as kids grow, the head size and weight grow to enable taller stronger golfers to hit shots of greater distance. Loft – Taller stronger golfers need less loft to get a golf ball airborne. Thus, our smallest driver head has 22 degrees of loft whereas our largest head has 14 degrees. Most adults play with 10 to 12 degrees of loft. We recommend our small woods for set sizes #1 and #2, medium heads for sizes #3-6 and our largest heads for sizes #7-8. You can of course decide to upgrade shaft length only if your young golfer is hitting their woods well.