Hello, generally speaking, according to the eyes of ordinary Asians, if you want to have a natural style, the width of 4~5 mm is more appropriate. If you want the double eyelids to be obvious, the width of 7~8 mm can also be accepted by most people.

But because everyone's eye type is different, the specific length and width can only be determined according to your specific situation. In Korea, a professional plastic pen is usually used to suppress the surgical line and approximate effect on the eyelid and adjust it to the best state you like at any time.

I hope the above information can help you, and hope to adopt it.