Hwoyee Professional Weather Balloon for Meteorological Purposes Aerial Video Holiday Party Decoration Entertainment Toys Huge Balloons (300g/380cm)

Hwoyee professional huge balloon,For meteorological purposes, the Suggested Inflation Volume of a 500g balloon is1.5-1.8m ³, Net Lifting Force=810g, Total Lifting Force=1360g, Bursting Altitude=18000m. Natural color close to white ,Neck Length≥10cm,Neck Diameter≤6.4cm,Body Length=135-160cm. Ideal for fairs aerial photos,meteorologists, science projects and grand openings. If you are using it for other purposes, you can charge more helium or hydrogen gas to achieve greater lift near the ground. If need to fly,these balloons must be filled with helium if they want to float up. You need to buy helium locally or fill it with hydrogen in a laboratory to ensure safety (dangerous, not recommended for ordinary people)., Manufacturer: Hwoyee