Just finished these babies up not too long ago. VERY labor intensive, the entire set took me about 40 hours total. They are all woven from tiny seed beads, in cubular right angle weave, layer by layer. They're not hollow, there are beads woven in the middle where you can't see them...makes em structurally sound. I finished them off by stringing them on illusion cord and then put a clasp on...I used the illusion cord cause I wanted them to be the total eye catcher.
Here's a another pic, to give an idea of the size: