The curls are defined by a letter representing the look of the curl. J curl is obviously more of J shape and is the least curly or lifted. B curl is a lesser or basic curl. C curl is the common curl that matches most people natural lash curl. D curl is the most dramatic and lifted, it will be the most visible from the front, it is also the most popular. L curl has a harsher L shape that makes these lashes ideal if working with clients who have hooded eyelids for whom D curl just isn’t enough.
Length is largely decided by the length of your natural lashes, be cautious of going too long as it may decrease retention or cause breakage. But everybody loves length so if you prefer them long maybe opt for a volume set that consists of more, finer lashes.
Tip: If you wear glasses and don’t want your extensions to brush them as you blink don’t go longer then a size 12 mm extension. Again can vary by person.