Gorilla-Tee Batting Tee Weight Bag, 10-Pound Durable Training Aid Rawlings Product Great for players of all caliber Adds 10 lbs. to tee base when filled with sand (not included) Increased stability with vibration/noise reduction Durable nylon construction Fits Gorilla-Tee models GORT, GORTJR, GORTRI Universal design fits many other batting tees