Special shell "coin" beads - south seas assortment
set of three - one of each pattern
 
These are double-sided, highly polished and have a wonderful feel (you'll just want to stroke them all day!) Beads, but can also be used in other projects of course!

These are from cowrie shells and cone shells found in the South Sea islands. 
 
created by a family business in the Philipines who have been working with shells for over 50 years