Boss Office Products Black Contemporary Ergonomic Adjustable Height Swivel Task Chair Angle Grinders Ribbed Channel Design: Grooved surface EB11700 Ribbed Channel Design: Grooved surface directs liquids and debris away to reduce slips and simplify cleanup Plug In design Breathable mesh back Breathable mesh seat cushion Flip arms Spring tilt mechanism Upright locking position Pneumatic gas lift seat height adjustment 25in black nylon base Hooded double wheel casters ) 275 Adjustable Height Yes Package Quantity 1 Arms Adjustable Folding No Massaging No Heated No Lumbar Support Yes Ergonomic Yes Casters Yes BIFMA ANSI Certified No CA Residents: Prop 65 Warning(s) No Swivel Yes Tilting Yes Arm Type Adjustable UNSPSC 56101500