Beads: 65mm long, 15x21mm diameter
Material: unknown metal content, the Tibetan jeweler calls it copal.
Picture is an example, each is only slightly different.

Beautiful and unique handmade Tibetan jewelry made in Nepal and Tibet by Tibetan refugees.
Repoussé refer to a metalworking technique in which a malleable metal is shaped by hammering from the reverse side to create a design in low relief.