Make your own bead pen! This high-quality black colored bead pen is constructed entirely of metal. It is 6 inches in length and designed to be perfectly balanced after adding your favorite beads. There are 2 1/2 inches of space to place your beads and the threads allow for 1/8" adjustment so you get the perfect fit. The mandrel (rod) is 3/32" (approximately 2mm) thick and works with beads having this size hole or bigger. In addition, Goody Beads carries the largest assortment of beads for bead pens. Search for "Large Hole Beads" and select "Beads" under Product Type to find an incredible selection of beads and spacers that are guaranteed to fit our bead pens.