Seed beads are rounded with slightly flattened ends. Sized by number, higher the number, the smaller the bead. Our seed beads are from japan which means they are more consistent in size, with a larger hole. Can be used in all types of beading projects. Size 11/0 - measures 2 x 1 mm, hole size of 1 mm, approximately 110 beads per gram or 17 beads per inch. Size 8/0 - measures 3 x 2 mm, hole size of 1 mm, approximately 39 beads per gram or 12 beads per inch. Size 6/0 - measures 4 x 3 mm, hole size of 1.3 mm, approximately 12 beads per gram or 10 beads per inch. Size 15/0 - measures 1.5 x 1.3 mm, hole size of .7 mm, approximately 250 beads per gram or 25 beads per inch.