• Excellent Durability and Stability Tees, Perfect Aiming • Proprietary Material: Made of a proprietary Special Pc mixture that is much stronger than other plastic tees. One pack of four birdie1 Tees lasts the average golfer a season. • Innovative Design: Exclusive Technical design helps you achieve consistent golf shots and make golf games easier.• Reduces Friction and Side Spin: Oversize microprotrusion head reduces friction and side spin for optimal accuracy and distance and protects your club faces.• The golf tee can be raised, lowered and adjusted, allowing golfers to hit their tee shots in the correct direction.