Sakura-Koi Watercolor Pocket Field Sketch Box: Assorted Colors. Capturing the moment just got easier with Koi Water Color Field Sketch Kits! These watercolor paints are formulated to blend easily and create an endless range of colors. Perfect for painting on-the- go! This 6-1/4x4-1/2x1-1/4 inch package contains thirty watercolor paints, one 9ml refillable water brush and one sponge within one sketch box. Conforms to ASTM D4236. Imported.