20 ft dia. Professional Weather Balloon, 600g

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Diameter at Release: 6 ft (1.8 m) Diameter at Burst Altitude: 20 ft (6.1 m) Nominal Lift: 3.8 lbs (1,700g) Maximum Lift: 12 lbs (5,450g) Burst Altitude: 110,000 ft (33,500 m)