Impulse sterling is the official supplier for the chinese national weight lifting team the impulse elite dual adjustable pulley has twin weight stacks and adjustable pulley positions allow for a range of movement and training options along with a exercise instructions on the machine frame for ease of use included in the pack are a range of cable attachments and a chin up bar that attaches on the top warranty of the impulse elite dual adjustable pulley main frames life time moving arms 2 ye