Impulse sterling is the official supplier for the chinese national weight lifting team the impulse elite arm extension is a great machine that focus s mainly on the triceps and will provide comfort for many people to exercise on the machine daily the warranty of the impulse elite arm extension 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 available options tubin