The colour markings along the shaft allow you to assess how deep you?ve placed the tee in the ground, allowing you to accurately adjust the height of the tee to suit your needs. Use the red strip for irons on par 3 courses, or yellow for fairway woods. Blue is perfectly suited for drivers that are less than 500cc. Green offers the maximum 83mm height, perfectly suited to raising the ball to the sweet spot of modern 500cc drivers. The tees feature a time-proven classic design that has evolved over years to provide excellent angle, distance & durability.