40 Inch birthday digital aluminum film guide balloon $ 4.26 Material: Aluminum film/aluminum foil Process: heat sealing 1: The material is aluminum film, the sphere has metallic luster, uniform color, beautiful sphere 2: Can be used repeatedly, easy to charge and deflate, don't throw it away once or once! 3: After the inflation is completed, squeeze the ball flat, the self-adhesive glue will automatically seal!