Toho size 6/0 round (rocaille) glass seed beads measure 4mm in length and 2.7mm in width and are supplied in 10g bags (unless otherwise noted), which contain approximately 150 beads; hole size is approx. 1.3mm. If you plan to combine Toho, Czech and/or Miyuki 6/0s, please keep in mind that the sizes vary somewhat. If it's important that your beads line up exactly, you might prefer to stick with one brand or the other. Toho beads are made in Japan.