Pilot Con-40 Twist/Piston Fountain pen Converter

Piston-style twist converter. Fits all current Pilot and Namiki pens. Four small metal agitators inside the barrel help break up air bubbles to keep a steady flow of ink.  0.4ml ink capacity,  screw/Piston  Type Package Weight : 0.009 kilograms Package Dimensions: 11.938 L x 0.508 H x 2.54 W (centimeters) Piston-style twist converter. Fits all current Pilot and Namiki pens. Four small metal agitators inside the barrel help break up air bubbles to keep a steady flow of ink.   Condition: New  Brand: Pilot  Type: Converters  Max Ink Capacity – Converter:  0.61ml  Item Weight:‎0.2 ounces  Product Dimensions: ‎2.8 x 0.3 x 0.3 inches