The lashes range from 2D-6D and anything over a 4D is going to appear that your client is wearing a strip versus a natural look that classic and hybrid extensions would give. This technique can be done with pre-made fans or the fans can be made by hand using a special tweezer. The fans are still attached to natural lashes but they come in .03, .05, .07 which are lighter than classic extensions. It typically takes 2-4 hours depending on whether or not the technician uses pre-made fans.