change row size

Hi everybody!!
I have a table with some nvarchar columns. When I try to put the size I can't to put it greater than 4000.
How can i change the row size?
Thanks!!That's the limit for that data type. Internally SQL Server uses 2*n bytes to store it. If you want to go up to 8000 bytes and don't need to use unicode character you should switch to varchar.