Gently encircle the nail piece with a soft ruler and measure the widest part of the curvature. If you don't possess a soft ruler, you can wrap paper around the nail, make a mark, and subsequently measure it using a standard ruler.
| SIZE | Thumb | Index | Middle | Ring | Little |
| XS | 14mm | 10mm | 11mm | 10mm | 7mm |
| S | 15mm | 11mm | 12mm | 11mm | 8mm |
| M | 16mm | 12mm | 13mm | 12mm | 9mm |
| L | 17mm | 13mm | 14mm | 13mm | 10mm |
PS: lf the measurement is 11.5mm, please treat it as 12mm.
