Sizing Kit includes, a set of 10-12 different size nails to choose from for the perfect fit for a custom press on nail set. It also comes with a sizing postcard to put the corresponding nail number size for each finger nail. Once you have sized your nails you will email a picture of the sizing postcard with your order number as well as a picture of the desired design. Custom press on nails start at $50 and can go up to $100. Once the desired design photo is received a price for the final custom set can be quoted.