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Looks like a 20 round Wilton maybe.
AFor which part? There were at least four different tips used for this cupcake cake.
The purple swirls on the base cupcakes would use a tip 10 or 12 round; the owl is filled in w/a large star tip - maybe an 18? and the wings & white eyes are probably the same.
The writing is probably a tip 2 or 3. Can;'t remember the # of the tip used to make the flowers :)