4 Inch Stainless Steel Mini Prep Bowls. At an adorable 300 mL capacity, these non-reactive stainless steel prep bowls are perfect for the little things. When you only need a cup or less of certain ingredients, big bowls can take up space and get in the way, so these mini prep bowls are a chef's dream. Have your flour, sugar, spices, and other ingredients measured and ready for any recipe!