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Packaged for those of you who are using bag and purse hardware and need only a small amount of a ultra firm stabilizer, this is a package of four 3" x 4" pieces of Peltex 71F Single Sided Fusible Ultra Firm Stabilizer.
Use it between fabric layers to stabilize the fabric where the hardware is being placed. Twist locks, magnetic closures, snaps, and where straps are sewn to the bag body all benefit from a small piece of stabilizer between the fabric layers where they are placed.