Hi Erin, if you're referring to the slicing of the apples themselves, thick and thin will likely mean something different to everyone. As a general rule of thumb, a thin slice would be anything under 1/4", most commonly around 1/16"-1/8" thick. Anything larger than that could be considered thick. If you were referring to cutting a thick slice of pie, in our opinion, it would be hard to make a slice of pie too thick! Annabelle@KAF

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