The Double 3 Action series is a trademark multi pen line from Platinum, and the MWB0-1000C is Platinum's bestselling model. It contains a 0.7 mm black ink, 0.7 mm red ink, and 0.5 mm mechanical penci ln one beautiful aluminum and anodized brass and chrome body. The pen functions through a rotary system, just twist the body to cycle through the different pen functions. Twist right to access the pencil and twist left to access the pens. Reflective bodies are available in multiple colors.