The “UNI-FLOW SYSTEM” ensures smooth writing performance to the last drop of ink. Excess ink flow from the ink reservoir can be temporarily stored to ensure constant ink flow to the pen point. Durable Tip Produces a thin and precise line. Features a durable pressure-resistant tip that won't bend or break even under strong pen pressure. Constantly sharp pen line is maintained from first stroke to last. Quick drying and smooth ink flow system mean your documents remain smudge free.