For those with a penchant for smooth writing, the Cello Aspro Mavro Ball Pen is the perfect choice. These Cello Pens come with 0.7mm tip in a feather-light body allowing the user to experience effortless fine writing. These ball pens online are ideal for office and school use. The Cello Aspro Mavro Ball Pens are designed with a trendy Yin-yang pattern. This ball pen set is an assorted mix of 50 blue, black and red ink ball pens in a reusable jar.