Product details:

Easily Adjustable Air Sping - Use A Standard Bike Pump (schrader Valve) To Fine Tune The Air Spring To Your Exact Preference. Want A Soft Spring That Limits You To A Couple Feet Of Air? Pump The Stick Up To A Low Air Pressure Somewhere Around 1/4 Of Your Body Weight In Pounds. Want To Jump Higher? Pump Some More Air Into It. It's As Simple As That! Perfect For Big Air Tricks - 9 World Records And Counting Have Been Set On The V4. When You Can Jump Over A Car The Number Of Tricks You Can Do In The Air Is Seemingly LimitlessThe Most Advanced Pogo Stick Ever Created - The V4 Pro Uses A Patented Air Spring That Is Far More Powerful Than A Traditional Pogo Stick But Weighs...like, Zero PoundsSizing - Small For 5'5And Under | Medium For 5'6- 5'11| Large For 6' And Up