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Czech Rulla Two Hole Cylinder Beads. Rullas can be used just like any other two-hole bead on the market and are very consistent in shape and color. Our Rullas are 3x5mm in size and come in 2 inch tubes with approximately 10.5 grams per tube. Depending on weight of each bead, there are approximately 10 beads per gram, giving you 105 beads per tube.