Princeton Neptune Watercolor Brush - Quill #4 Princeton Artist Brush Co. from $18.98 $44.95 Qty. Add to Cart SKU: PB4750Q-4 This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Brush head is Approx 7/16" Wide and 1-1/2" long. Handle is 6" long. Tweet