Portable Doorway Speed Bag Platform with Integrated Pull Up Bar, Fits in any standard doorway, The EZspeedbag is solid and stable and performs like a Pro Gym Speed Bag right in your home or apartment. Easy to install, get a tremendous workout, improving your punching speed, power and hand eye coordination. The Wolrd's First Portable Doorway Speed Bag Platform! Please be advised that when installed correctly, the EZspeedbagis rock solid and stable with zero wobble. If you are installing, please have 2 people installing. Once installed, if there is any shake or wobble in your EZspeedbag, it is installed incorrectly. Please review these installation videos and contact us direct with any issues: https://www.youtube.com/watch?v=Im_AWD_j3ZA https://www.youtube.com/watch?v=9nAe2q7sH1A