The usage of small, rubberized "tees" for field goals (not the same as the kickoff tee, but rather a small plastic block; such tees come in heights of ) varies depending on the level of play. Unlike in the lower ranks of football up to the high school level, the NFL (and most other professional leagues) has never allowed the use of small rubber tees for field goal attempts, having always required kickers to kick off the ground for such attempts (and for extra points). In 1948, the NCAA authorized the use of a small rubberized kicking tee for field goals and extra points, but banned them by 1989, requiring kicks from the ground like in the NFL. The Canadian Football League, despite its status as a professional league, "does" allow for the use of such a tee for field goals and convert kicks, but it is optional, as kickers can also kick off the ground if they so desire.