Waistband core, 3cm wide, actual measurement over 9m. Measured after unwinding the roll. This is the remainder of a used item. The pins used to hold it in place have rusted, and there are a few brown spots. There is no problem with use, so please consider purchasing if you don't mind. Sew this inside the waistband of skirts or pants to create a firm waistband. Please note that this is not an iron-on type.