Trex Transcend Lineage 1 in x 12 in x 12 ft Composite Fascia Deck Board Rails Upholstered in black crepe fabric Upholstered in black crepe fabric Back angle lock allows the back to lock throughout the angel range for perfect back support Seat tilt lock allows the seat to lock throughout the tilt range Pneumatic gas lift seat height adjustment Nylon base Hooded double wheel casters 20 Diameter chrome footing Adjustable arms but they are ideal for decks and porches Comprehensive Warranty: Backed by a 50 year limited residential warranty for peace of mind significantly reducing its environmental footprint and supporting eco friendly building practices