These U-part wig caps come with a 1" or 2" opening depending where the opening is placed. They are 3.5" in length and provides a very nice parting area. To create the U-Part Wig, I place ventilation around the U-Part and along the sides creating a flawless hairline. This allows you to wear your hair in various ways including a high ponytail. I no longer have these caps for sale, they are currently being used to fill client orders.