Executive and management models with molded back and seat provides great confort and support. Synchronous-tilt mechanism for noticeable smoothness in movement. Standard seat sliding mechanism provides additional seat depth. Onyx welcomes NEW guest models to the family! Available in a choice of Black, White and Platinum polypropelene backrest shell with upholstered seat or fully upholstered seat and back. They with or without arms and with or without casters. Onyx guest chair can be stacked.