The Hang2it Shower Curtains have inside their 4" top header, 10 (for standard width size) plastic grommets, also described as hooks or as we prefer to call them buckles. Each buckle, constructed with an oval opening, are spaced evenly and precisely in the upper portion of heading to allow proper balance for the shower curtain to move across the shower bar with little to no friction when opening and closing the curtain for use. Custom sized widths will be adjusted to proper number of buckles needed.