Miyuki 3mm square beads (SB3) are just a little bit smaller than the standard 4mm square beads. Their flat sides allow them to sit comfortably next to each other in patterns, and they also work well when used in brick, peyote, and herringbone stitches. 3mm square beads measure 3mm x 3mm x 3mm with a hole size of 1.3mm. Count is approximately 21 beads per gram.