Opt4 high-density chairs let you mix and match design and price options. The simple, refined style and material options enhance design versatility. Choose from mesh/mesh, poly/mesh, upholstered/mesh, mesh/poly, poly/poly or upholstered/poly seats and backs. High-density chairs are available in three classic colors: black, stone grey, and white; as well as a wide array of frame color options (including chrome). For efficient storage, high-density chairs stack 38-high on dolly (10-high on floor); chairs with upholstered seats stack 20-high on dolly.