When would I use 70mm tees?

Many modern drivers have large heads and, as the ball on your set up to a drive should sit with the top of the club around halfway up the ball, standard 54mm tees are too short,causing you to ‘top’ the ball or perform other bad shots, and therefore lose the benefit of the club. 70mm tees allow the ball to sit in the correct place at set up and ensure that you have the best chance of hitting a good shot.