Spray painted steel.
Brakes incorporated in 2 of its 4 wheels.
Anti-scratch. Protector to avoid scratching the walls.
Accommodates a wide variety of chairs. 48 alexandra / 48 alex / 24 norman / 24 otto / 18 alvarstool / 30 boston / 48 bigalexchair / 36 aranchair / 36 ludwigchair / 36 olafchair / 36 olafskidchair.”