Attributes and Features (non-payable)
Attributes and Features both are taxonomies. You find these taxonomies from Dashboard->Inventory->Attributes
and Dashboard->Inventory->Features
link.
You can add unlimited product attributes
from this general tab like the following screen-shots.It has drag-and-drop facilities to sort the attributes.
You also can add unlimited product features
from here.
Product attributes and features will be showed in tab in single product page.