Yes. You must purchase and size your nails before you order a nail set! Your nails are not the same numbers for each nail shape, so you must have the correct shape for the nails you want. (Example: order a stiletto sizing kit if you're ordering stiletto nails) All custom orders require a sizing kit to ensure the best fit. It is your responsibility to size your nails correctly and provide accurate measurements. If you are between two sizes, we recommend sizing up. Orders cannot begin until sizing information is submitted.