What is the size of disposable shower cap?

The size of disposable shower cap is 28-30 cm in diameter. According to relevant information, public information shows that the size of disposable shower caps varies from brand to manufacturer, but the usual size is about 28-30 cm in diameter. Disposable shower cap is a sanitary product to protect hair from being wet by water, which is usually used in beauty salons, barbershops, hotels, hotels, hospitals and other places.