Addendum - 03/03/2015
On 02.03.2015 the gas spring had already been renewed.
The desk chair was a gas pressure spring class. 3
Up to 180 kg. Costs 14.95 euros.
The gas spring is no longer held the weight of people.
Addendum - 18/07/2015
Today a caster is broken out of the hub.
The hub of plastic has not kept long.
I leave it at the 2 stars because the seat and hold the back yet.
Let's see what breaks next?
Summary: I would not buy the chair !!!