This Staedtler Pigment Liners Set of 4 with 2 extra Free pens brings you six truly versatile black liners in a range of widths from an ever-innovative brand.
Lightfast, quick-drying, smear-free and indelible, the combination of a long metal tip and softer writing action make them easy to use with rulers and templates for technical and architectural drawing but also ideal for writing and sketching.
Since they are waterproof, you can also use them with watercolours or other water-soluble media without bleeding.
If you leave the cap off, you can leave them for 18 hours before they dry out. This set should cover all your needs.