50-piece Pack Sky Lantern, Hot Air Balloon, Christmas Eve, Halloween, Wedding and Ceremony Wish Lantern with Flame Retardant - 100% Biodgradable Chinese Paper Lanterns Flight height up to about 1000 meters, Duration: 10-12 min (approx) As it flies very high, it's safe to use. Made of flame retardant and 100% bio-degradable paper. Mixed colors available. Safe to use