For those that like a bit of colour on their zentangle work this is a perfect pack of 6.
Here is a bit of information about Pigma pens:
Pigma Pens contain a quick drying archival pigment ink and are waterproof. These pens can be used on a range of surfaces to include quality paper and cotton fabrics. They are perfect for tangling, scrapbooking and journaling and do not bleed like other pens.
This set contains a set of six colours at .25mm/01 size to include: black, blue, red, green, purple, and brown.