The seat shells are embedded in a frame construction. Makes a stable impression. The backrest can be adjusted perfectly using the lever. No problem finding a good sitting position.

Works great on my Formula racer chair purchased in 2016 (almost 7 years ago). Also purchased on a Friday morning, delivered on Monday.

It's been around a month since I've purchased this chair, and it's both extremely comfortable as well as ergonomic. My back used to have a lot of pain from sitting and playing a lot of games, my old chair had no support for my neck or my lower back. If you find yourself sitting for more than 2 hours at a time to play games I would recommend DX racer chairs in a heartbeat.