Miyuki Spacer Beads are available in two different sizes. 2.2mm x 1mm and 3mm x 1.3mm. The spacer beads are a flat disc shape and fit perfectly with your seed beads and are very similar to the Demi Round beads.
2.2mm x 1mm are equivalent to a size 11 seed bead and 3mm x 1.3mm are equivalent to a size 8 seed bead. Approx. 6g in weight. 2.2mm has approx. 945 beads per tube and the 3mm have approx 390 beads per tube.