The Faber-Castell Ecco Pigment 0.6mm black fineliner uses waterproof, highly lightfast pigmented ink, perfect for drawing and tracing paper. The calibrated 0.6mm metal-coated tip ensures precise lines with a ruler and set square without warping or smudging. The ergonomic body incorporates a flexible metal clip for attaching to a bag or notebook. It is the recommended precision technical tool for architects, designers, and illustrators.