Aeron work chair by Herman Miller size B (medium)
Tilt function and fully adjustable arms
Lumbar support with 2 1/2" castors that work on both hard floors and carpet
Graphite base with Pellicle® classic carbon material

Warranty Information
This product is covered by the Sam’s Club Member Satisfaction Guarantee.

Don’t know how many years. One review mentions 10 year warranty.
$ 449 is a pretty good price from a reputable seller.