I think Featherweights are someplace between 9 and 11 pounds.
Yes, they are all metal, but they are small and don't have all the computers and extra stuff that today's machines have.
Featherweights are VERY popular among quilters and ladies who take machines to classes, etc, because of their light weight.
I used to have a 95 year old aunt who carried her Featherweight to sewing classes and monthly sewing meetings.