** These circa 1990 micro bugle beads from the Czech Republic are also referred to as "Maco Tubes" and are close in size to Japanese Micro Bugle Beads. Because of their thinner diameter (1.3mm) they would work best with seed beads sized 13/0 or smaller. Hex Cut bugles have six sides for added sparkle under the light. Silver-Lined adds to the reflective quality of the beads, but tips may oxidize (tarnish) and darken over time.