flash banner ads

Hi everyone: anyone out here or there working in the online advertising industry? mainly, I want to find out what is the deal with ad traffic co. asking for 30k max weight flash banners. also, when they say max weight 30k for flash, do they mean the .fla file or .swf file. Really confused here because they ask for a submission of both files but almost impossible to keep the .fla file at 30k sometimes.

swf at 30kb. fla file can be any size and you should be charging extra to send them the fla.