With the XOXO JOE SIZING KIT you can easily find out which nail tip sizes fit your natural nails without measuring. Simply hold the numbered transparent nail tips on your natural nail. Start with the little finger of your left hand and work your way to the right until you are at the little finger of your right hand. Write down your numbers for each finger in this order. Now you can specify your exact sizes for your next nail set order by sending a message when completing the purchase.