Parties without balloons are incomplete. PJ Masks Mylar balloons are a type of helium-filled balloon featuring a design inspired by the popular animated television show, PJ Masks. The balloons are made of a special type of material known as Mylar, which is a shiny and durable polyester film that can retain helium gas for an extended period. These new latex retro balloon set collections are full of elegant and luxurious atmosphere to meet the needs of party decoration. They will bring gorgeous colors to any event party, birthday party, wedding party, costume party.., and makes you a different party life.