Wig cap that serves as the base for sewing when making wigs. Made of stretchy fabric with elastic around the head circumference. Sourced from wig makers in the Philippines. Some are old stock and may have weakened elastic or stains. Photo 1 shows sizes 13-14, 15-16, 16-17, and 17-18 inches from right to left. These are larger sizes that were purchased for trial. Photo 2 shows an 8-9 inch cap placed on a ball. Regardless of size, they are composed of three parts: center and both sides. While it's tight to use a smaller cap on a larger one, it's safer to use a slightly larger cap as the size can shrink during sewing.