Rock Crystal smooth round beads are transparent man-made clear quartz that can provide dazzle without adding color. Strands are sold as temporarily strung. These beads are man-made and as such are smooth and uniform in color.
4mm beads- the hole size is 0.8mm - big enough for a 24 AWG wire but may or may not fit a 20 AWG wire.
6mm beads- the hole size is 0.9mm - big enough for a 20 AWG wire but too small for an 18 AWG wire.
These beads may not be perfectly round and can range in diameter +/-0.5mm.
Strands are sold as temporarily strung. Strands are approximately 16" and can vary +/- 0.5".