This is a versatile and practical pen that offers 4-color convenience at aclic. Perfect for medical, bookkeeping, etc. Blue barrel.Medium PointKey Benefits: * At the click of a color-coded button you select the color you want - blue, black, red or green * Quality ink, quick drying and smooth writing * Tungsten carbide ball, perfect sphere and very resistant * Opaque blue barrel: medium point 1mm - line width 0.4mm * Opaque orange barrel: fine point 0.7mm - line width 0.35mm * Ventilated cap compliant with ISO 11540 / BS 7272-1 standardEnvironmental benefits * Long lasting product: 2 to 3 kilometers writing length * Light: designed and manufactured with just the right amount of raw materials * Refillable * PVC free product