Impulse sterling is the official supplier for the chinese national weight lifting team the impulse elite 4 stack multi station has four different stations that will be able to lots of different exercises for the entire body warranty of the impulse elite 4 stack multi station main frames life time moving arms 2 years linear bearings springs adjustments 1 years hand grips upholstery pads and rollers all other parts including end caps 6 months tubing thickness range is from 2 5 mm to