Matters needing attention
(1) the balloon is rated size, and too much inflation is easy to explode
(2) sharp objects/dirty ground are directly exposed to sunlight and excessive pressure, which is easy to damage and crack the ball skin
(3) helium/hydrogen can only float for 6-14 hours, so helium and hydrogen must be replenished on the day of use
(4) the completion rate of the general balloon packaging is about 98%, and there are some leakage phenomena, which is a normal problem.