Not sure what's your size?
Best way to find out what's your size is to measure your nails. Please follow the guide:
1) Using transparent tape, place it across the largest part of your nail.
2) Mark the 2 sides of your nail on the tape with a pen.
3) Remove the tape and measure it with a ruler.
4)Note size for each nail. For example: Thumb- 18mm, Index 15mm, Middle 10mm etc...
5) Order your nail set choosing 'custom' for size and leave a note with measurements for each nail.