Package Includes : uni-ball Air UBA188M Micro Roller Ball Pen, Tip Size - 0.5 mm, Mechanism - Click-off Cap, Body Color - Black, Ink Color - Red, Size - 1 Pcs
The metal ball of the nib is encased in an acetal plastic, rather than the standard metal surround, which allows for a smoother flow of ink around the ball, and an increased flow as further pressure is applied.