Amazon.com: Pentel Arts Pocket Brush Refills, Black Ink, Pack of 6 (FP10BP6A): Home & Kitchen
Amazon.com: Pentel Arts Color Brush with Pigment Ink, Fine Tip, Black Ink, Pack of 1 (FP5FBPA)
Amazon.com: Pentel Arts Pocket Brush Pen, Includes 2 Black Ink Refills (GFKP3BPA) with Pentel Arts Pocket Brush Refills, Black Ink, Pack of 6 (FP10BP6A): Arts, Crafts & Sewing