Miyuki cube beads are also known as square beads, and are available in three sizes. Square or rectangular Japanese seed beads are made as 1.8mm cube beads, 3mm cube beads, and 4mm cube beads. The smallest 1.8mm size is shaped like a square, while the 3mm and 4mm cube beads are more rectangular. The 4mm size is the standard size and is available in the largest range of colors. The 1.8mm is the newest size. Cube beads are less uniform in shape than many of Miyuki's seed beads. They have relatively large holes and can fit on a narrow leather cord.