Non- ferous is used to refer to any substance which doen't contain iron. Here is an example of it being use to describe a ceramic.
http://www.vesuvius.com/lwwcm/publishing.nsf/Content/crucibles
Non-ferris is a misspelling of non-ferrous, meaning Not Ferrous. See http://en.wikipedia.org/wiki/Ferrous for the definition of Ferrous.
http://www.lme.com/non-ferrous.asp
this link should help you out.
cheers,
The Ringmaster
Any metal which is not iron or does not contain iron. Steel is made with iron, so it would not qualify.
If you are asking about metals, non ferrous metals are bronze, copper, brass, silver, gold, lead. They do not spark.