These are size 11 Delica Beads. Delica beads are glass beads made by the Miyuki company in Japan. Size 11 is smaller than size 10.

They are sold in a 7 gram tube (approximately 1400 beads.) 

The beads are tube shaped, measuring 1.6mm x 1.5mm (size 11).

The bead hole size is 0.8 mm. The diameter of the hole is large enough for multiple passes of thread.

They are used often in bead loom weaving, peyote stitch and brick stitch because they line up uniformly.