2-in-1 easily converts in seconds Dynamic hanging tee design makes learning to play fun Sturdy X base with weighted legs for added stability Easy twist and lock height adjustments from 18" - 36" 21" plastic bat. (4) Baseballs with fabric self-stick covers The MLB 2-in-1 Grow-With-Me Batting Tee is designed for first-time athletes learning to play baseball. Start by practicing from the beginner hanging tee, which can be adjusted form 18" - 36". As your young player grows, remove the hanging arm and attach the traditional tee topper, which can be adjusted in height form 25" - 36". With larger height adjustment for the traditional tee design, this two-step grow-with-me trainer is designed to last throughout the first stages of your young athlete's career.