Heat-set glitzy embellishments to projects and clothing. Using Purple Cows Melt Craft Iron (pcp-5050) sold separately, and these interchangeable tips you can add a little sparkle just about anywhere in seconds. The crystals and nail heads included in this kit have a heat activated adhesive on the underside and when heated using the Melt Craft Iron, makes a wash proof bond on fabrics and other porous surfaces. You can use the individual size tips to specifically work with the same size gems or cluster several hot-fix embellishments together and use the button tip to heat set the motif. Each package includes 5mm crystal flat tip, 9.5mm crystal flat tip, 12ss crystal tip, 16ss crystal tip, 20ss crystal tip, button tip, 144 assorted crystals in 3 sizes (12ss, 16ss and 20ss), 144 assorted nailheads.