Roll a 24 x 11 mm Oval and a 12 mm round bead with this set. Pierce these beads while they are inside the bead roller! Helps you get the hole right through the center of the bead, also avoid the possibility of getting fingerprints on your beads from handling them to pierce. About 20 piercing pins are provided with this bead roller. See our Pro Bead Rack in the Miscellaneous category. Polymer clay is the clay primarily used here at Poly-Tools, Inc., but other clay mediums can be used successfully with our bead rollers. Your satisfaction is guaranteed with all of our products!