The Pentamax is an Australian designed and manufactured chair, suitable for the home or office. Pentamax executive ergonomic chair comes with a synchronised mechanism that allows dynamic sitting – the ultimate in comfort and ergonomics. It has a Level 6 AFRDI rating and is designed and manufactured in Australia. Pentamax comes standard with a height adjustable seat and ratchet-adjusting back height, with a synchronised mechanism that moves with you to adjust the angle of the seat and back as you work. It is also available with height adjustable arms. The back comes in medium or high back heights, on a five-star swivel base on castors in either black nylon or polished aluminium. An optional sliding seat is available. It features a super-comfortable moulded dual-density cold-cured fire retardant foam seat and back, and can be upholstered in your choice of fabric.