The Derwent Artbar Set has triangular-shaped bars that can be used for fine detail and marks.
Set of 24:
Primary Yellow, Primary Red, Strawberry, Iris, Primary Blue, Kiwi, Honeycomb, Paprika, Pacific Blue, Green Earth, Prairie, Raw Umber, Wheat, Mango, Blush, Blue Lace, Spearmint, Beige, Burnt Umber, Alizarin, Dark Indigo, Dark Forest, Black and Opaque White.