This is a left/right set of Remastered Aeron “fully adjustable” armrests. Scuffs, scratches, dings on the metal yokes and armpads. The armpads are at the end of their useful life and will need to be replaced. These are what Herman Miller calls “fully adjustable” armrests. Informally known as “4D” armrests. This means the armpads. To be perfectly clear, these Herman Miller “fully adjustable” or “4D” armrests are NOT a 1:1 copy of Steelcase’s 4D armrests; these Herman Miller armrests do NOT slide laterally but only rotate/pivot laterally. These can technically be fitted to a Classic Aeron — message if you need assistance. These armrest yokes will physically bolt up to the Classic Aeron’s swing arms… If you don’t understand what this means, then, this swap may be too advanced for you.