Actually it depends on how you intend to print. If you are buying quarter sized paper stock the as Peter said, you'll need to define a custom page. But if you are using full size paper stock that you'll be cutting or tearing to size, you'll need to use the normal paper size and then create a template with proper dimensions. (If the paper stock is from Avery they probably already have a downloadable template prepared at their download site.)
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Quarter page! Need answer quick!
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