Fibre-tip pens in ergonomic triangular shape for relaxed and easy writing and colouring. Stable, pressure-resistant tip and ventilated cap conforming to ISO 11540 and BS 7272-1/2. Triplus are dry safe and can be left uncapped for days without drying up. Water-based ink washes easily out of most textiles. Line width approx. 1.0 mm.