HELIUM-FREE, "Dura Bonkers", are RE-USABLE BALLOONS that create a fantastic visual display. A great marketing investment. Specially-engineered plastics retain the Dura Bonker's balloon shape and fade-resistant technology & specially pigmented polymers, will withstand nearly all inclement weather conditions. Dura-Bonkers screw into the cup making them secure and theft-resistant. Store and reuse Dura-Bonkers over and over. Say goodbye to helium forever!