what is the number for the icing tip, the big one to put the base frosting on a cake? Thanks! Andrea

The large icing tip is Wilton 789:

http://cakecentral.com/cake-decorating-ftopict-580443-.html
(Gives tips for using.)

So you know what it looks like:
(It's with the basketweave tips.)

http://www.cakecentral.com/article42-Decorating-Tip-Numbers.html

HTH

Thank you!!!