Harbour Dining Chair, Polished Aluminium Star Base w/Casters

What Audo Copenhagen says about it

Once you’ve chosen the Harbour Chair shell style that will be cradling and supporting your body, you can now also choose a clover-shaped swivel base so you can spin around as needed – and roll around as wanted, should you opt for castor wheels. The base is available in two finishes – polished aluminum or powder-coated aluminum in black . All Harbour Chairs have been upgraded with extra foam in the seat for better sitting comfort, increasing from 15 mm in thickness to 25 mm.