Aluminum foil balloon: 1) metal film made of balloons. 2) rich colors, many patterns, with a variety of shapes. 3) 45cm aluminum ball ball helium can keep a week or so floating, 80cm aluminum ball ball helium can be kept for about fifteen days to fly. 4) advanced technology, can be automatically sealed to avoid leakage. 5) due to thermal expansion and contraction, filling helium, due to different ind...