Staedtler Lumocolor Duo 348 Permanent Marker Pen Blue Dual Tip 0.6 and 1.5 mm The blue Staedtler Lumocolor Duo 348 permanent marker has a 0.6 mm tip at one end and a 1.5 mm tip at the other. The ink dries quickly once applied, and the marker survives several days uncapped without drying out (ISO 554). Product details: - Brand: Staedtler - Product type: Permanent marker - Model: Lumocolor Duo 348 - Tip: Bullet, double-ended - Line widths: 0.6 mm and 1.5 mm - Ink colour: Blue - Cap-off time: Several days (ISO 554)