â—† Revolutionary Air-Tip technology for ultra scratch free writing. The Air tip of Uniball AIR made of soft acetate minimizes the friction with paper for an ultra smooth and fatigue free writing. Depending on your writing style (angle, pressure, strength etc.),the AIR suspension mechanism adapts the tip to your own writing. The 'uni-ball AIR' is a modern pen that features the latest technology in mechanism which will improve and change the writing performance