This concrete pen holder couldn’t be any cooler. The hole openings are perfect for felt tip Flair pens or LePens. Also would work perfectly to hold the ends of paintbrushes! Size: 2.25" cube. There are 16 hole openings, with 3/8" hole diameters. Concrete Pencil Holder. Minimal Desk Decor. Cube Pen Paintbrush Home Office Organizer