Cushioned dished seat pad with waterfall front Contoured backrest for added comfort Triple lever mechanism for gas lift, seat and backrest tilt control Height-adjustable backrest Backrest angle adjustment Asynchronous mechanism Optional armrests Recommended maximum weight: 150kg Recommended usage: 8 hours 2 Year Warranty 3 Lever Asynchronous is operator seating with inherent good quality built in. Our 3 Lever Asynchronous include dished seats, contoured backrests, waterfall fronts, gas lift height adjustment and seats and backs with adjustable angle.