For premades: Pay attention to the boxy base. Natural lash diameters are not made that thick, so it is very hard to blend the box into the NL.
For easy fans: some brands will shift back into its manufacturing reset, once application is applied and if the adhesive does not set right away , the base will continue to shift.
Premades does not last as long as hand made fans. You should let your clients know what they are paying for.
The thicker the diameter in mm they boxer they will be