Birtee PRO SPEED Individual Tee Packs - Size #6 - 2 Tees Per PackThe revolutionary BIRTEE PRO golf tees are designed to be fast and easy to use for golfers of all calibres and ages. People love their consistency. They are also very durable and recyclable and are Made in Canada. They provides every golfer with a constant height for any size club (Drivers, Woods, Hybrids & Irons) for every tee shot. The 8 sizes conform with USGA & RCGA Rules of Golf and the U. S. Patent was also granted on May 31, 2011. The BIRTEE