These replacement shrink bands secure the blades on 125-grain, 2.25-inch 2-blade Swhacker broadheads, made of flexible, military-grade plastic that won’t stretch or rot. To install, a band is placed over the tip with the blades fully enclosed, then slid down the ferrule into the retaining groove; if it doesn’t seat, gentle heat from a lighter or hair dryer shrinks it into place. Sold 18 to a pack.