Tabber usually uses the same font size as your product description. If you want to set a different size, then do the following:
Go to Design / Library / Layouts / TabbedDescriptions / Tabber Setup.
Look for the line:
Add your desired font-size there. E.g (big headers and content):
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.tabber {margin-top: 5px; font-size:1.2em;}
This will set the size for both the tab headers and content. If you want a different size for the tab-content, then look for the line:
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.tabinner {width:100%; padding:0; overflow:auto;}
And change to E.g (big headers, tiny content):
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.tabinner {width:100%; padding:0; overflow:auto; font-size:0.6em;}
These are only example settings. Tinker with the sizes to get what you require.