bTEE Barrel Bat has the same specifications as the brand Tee Tanner Tee Pro. 4 kilometers base aluminum shaft for rust resistance. Used by Olix Buffaloses and professional baseball balls. BTEE Precautions *Do not place the ball case or weight on the base to prevent the tee from falling over. Durability: Unless likely to hit the highest, please do not hit the black plastic shaft with the first aluminum shaft. Pull out the second aluminum shaft. Try to hit the rubber base several times to decrease durability. If the tee itself falls over it will be a strong swing. If you use a soft bat or a special bat made of urethane or rubber such as beyond, it may cause deterioration to be faster. We do excessively Par Swing Long Tee and other maximum swing practice is not recommended. Please gradually increase the output after using the correct swing start while checking the height of each course. *We do not accept refunds or returns after use.