1.I-cushion kanye ne-backrest yakha i-engeli engu-15 degree negative.
2.Adjustable knee pads afaneleka kubantu bobukhulu obuhlukene.
3.Ubakaki owenziwe nge-polyurethane ngokubunjwa okuhlanekezelanayo ungavimbela ukuhuzuka futhi unciphise ngempumelelo umsindo.