A twin sister of the AB1 base. It only differs in the shape of the polyurethane scalp layer. The front part is made out of a thin polyester netting, which is reinforced around with a thick polyurethane layer. Due to the fact that polyurethane is used, it is easier to clean and it may also be utilized with any hair density desired.. It has to be added that one has to take special care of the front, which is made from netting.