Tortoise Transparent Czech Glass Round Beads 6mm Czech glass round beads available in opaque, translucent, opal, swirl and metallic finishes. 6mm Czech glass rounds are small enough for the most delicate of jewelry pieces. Ideal spacer beads on necklaces and bracelets and as accents on seed beadwork/sculptural jewelry. Beads are packed loose, ready to use. Size and pack specifications: Beads are 6mm in diameter. Approximately 50 beads per pack.