These Czech seed beads are size 3/0. With all seed beads, the lower the number, the larger the bead!
Size 3 seed beads are quite big when compared to size 11 or 15. You get approx. 60 beads in 10g and these beads measure approx. 4mm x 5.5mm with a hole that comfortable takes a 1.5mm piece of silver plated wire with a little space left over.