Czech Fire Polish Glass Beads 6mm Round Crystal Vitrail (25) Czech Fire Polished 6mm Round Beads in Color "Crystal Vitrial" The Vitrial finish is a rainbow effect applied to 50% of the surface of each bead, for beautiful reflections throughout. In Czech Fire Polished beads, the shape called "Round" is actually more of an oval. Measurements: 6MM long, 5.5MM wide. Quantity: 25 beads, which is approximately 6 inches of beads when strung.