EK SUCCESS-Create Your Own Style: Hotfix Assortment. Flat back hotfix crystals that featuring CRYSTALLIZED-Swarovski Elements have a heat-activated adhesive coating in place that bonds to fabric for a washable reflective finish. Adhere in place following package instructions using an iron or Hotfix tool. This package contains an assortment in size and colors: 150 total pieces. Available in a variety of styles: each sold separately. WARNING: CHOKING HAZARD: Small parts. Not for children under 3 years. Imported.