Jams are a very thin sheet of vinyl that, when heated, becomes soft and pliable. The adhesive is heat and pressure activated and forms a watertight seal on your nail. When you open the package, you won't smell paint fumes or chemicals, there is no smell when heating. I've left mine on the heater for 10 minutes without a hint of smoke or smell. They are toxin-free, latex-free, gluten-free, vegan, and made in the USA! Never animal tested and safe for even the littlest hands! Check them out at www.nailcandynaz.jamberrynails.net