You are bidding on 10 seeds of Eucalyptus robusta. 

It is a beautiful tender tree that gets unique great blue-silver foliage and this particular species can grow to heights of over 100 feet and is popular for timber, ornamental value, and as a windbreak.  These beautiful plants are hardy to USDA zone 9, possibly colder, and they grow best in full sun to part shade.  They would make excellent additions to your rare plant collection, or just make a unique statement in your yard.

HAPPY GARDENING :)