What we have is a great chair that comes with pneumatic controls. These let you raise or lower your seat and rock in your chair or even remain securely sitting up.
This is an adjustable office chair that helps promote a comfortable seated position, which is important at your desk or in front of the computer for long stretches of time. And as a writer, you will be seated for a while.
There is a tilt-tension knob underneath the chair seat that makes it more comfortable or firmer to rock in your chair, depending on which way you turn it. Plus it has a smooth upholstery that gives it an A grade look.