Louisville Slugger Team Ultra Instructo Tee Make every swing count with the Louisville Slugger Team Ultra Instructo Tee. This tee is designed to help generate power from the lower body to achieve quicker bat speed, which helps hitters develop swings that produce line drives, hard ground balls, and fly balls that carry. Practice text book swing mechanics with each rep, and you'll also get immediate feedback for improper swings. The included Retract-a-Ball devices enables players to get more reps without having to continuously chase balls. The Instructo Tee is completely portable, and has a steel construction and adjustable height.