FeaturesTwo markers in one3.5mm (medium) bullet tip one end, 0.6mm (ultra fine) nib the otherPermanent low-odour ink suitable for most surfacesIdeal for use on CDs, DVDs, plastic, vinyl, glass, metal, cardboard and some wood surfacesPack of 12 black inkPentel Twin-Tip - an innovative permanent marker with a medium bullet tip at one end and fine point at the other. The Pentel Twin Tipped Permanent Marker (Box of 12)  is suitable for use on CDs, DVDs, plastic, vinyl, metal glass, cardboard and some wood surfaces Bullet tip - average approx. line width 1.75mm, fine tip - average approx. line width 0.5mm.