One of a kind, all natural river rocks polished to have a "wet" look and wrapped in thin wire ready to be strung. Currently 5 different options available. Please make note of which style you would like at time of order. If you don't see one in the shape you'd like, check back soon and it might be there. Size comparison is to an AUS 5 cent - approximately equal size to US 10 cent - and AUS 10 cent - approximately equal size to US 25 cent.