You are bidding on 5 seeds of Pterygota alata. 

It is a beautiful tree that gets lovely small yellow/brown flowers that develop into interesting large brown seed pods, and great green foliage.  These beautiful plants are very hard to find and are hardy to USDA zone 9, possibly colder.  They would make excellent additions to your rare plant collection, or just make a unique statement in your yard.

HAPPY GARDENING :)