- 4-legged base: the metal base is finished in a standard Artifort powder coat colour. Optional in chrome . -- Nina C cross base (not swiveling): the metal base is finished in a standard Artifort powder coat colour. Optional in polished aluminum with a chrome tube. -- Nina C cross base, swiveling with return mechanism: the metal base is finished in a standard Artifort powder coat colour. Optional in polished aluminum with a chrome tube. -- Nina D height-adjustable 5-legged base with castors: the metal base is finished in a standard Artifort powder coat colour. Polished aluminum is an option. The gas spring and castor caps are always finished in chrome.