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Professional weather research - High-quality natural latex balloon for meteorological examinations, radiosondes & altitude measurements. EXTREME BURST HEIGHT OF 18,000M - Our professional 300g weather balloon reaches the stratosphere. Ideal for meteorologists, altitude research and science projects. Natural cream white colour. STRONG LIFTING POWER - Net buoyancy 810g, total buoyancy 1360g with recommended fill volume of 1.5-1.8m³. Perfect for heavy measuring probes, aerial photography or as an eye-catcher at folk festivals and large openings. Large Dimensions - Body length 135-160cm, neck length ≥10cm, neck diameter ≤6.4cm. The burst diameter is approx. 380 cm - impressive dimensions for maximum visibility. Flexible lifting force adjustment - For higher loads on the ground, more helium or hydrogen can be added. Safety instructions: To climb up, fill with helium (buy locally). Hydrogen only in the laboratory (dangerous, not for amateurs). MULTI-PURPOSE - Whether for weather stations, school projects, promotions or aerial photography - this giant balloon is a reliable tool.