MIYUKI glass beads are considered a "world standard" for their high quality, brilliance, and uniform shape. They are highly sought after by fashion designers, artists and bead fans alike. 

Miyuki Japanese 15/0 seed beads are available by 12-13 gram 3" tubes. There are approximately 3500 15/0 beads in a 3" tube.   15/0s are 1.5mm in diameter, with a .7mm hole.

In comparison to another Japanese brand called TOHO, both are of high quality.    Miyuki beads are more cylindrical; Toho more round.   As a result, Miyuki 15/0s are slightly different in size than Toho 15/0s.   TOHO have smaller holes.    TOHO finishes have a slightly more textured finish with more variations and often slightly more saturated in color.

Czech beads, in comparison, are much more irregular in size, more saucer like in shape, with much sharper holes and holes which vary a lot in size.    A third Japanese brand - Matsuno - is more similar to the Czech beads, though the holes are not as rough.