The outer surface of Alec balloons usually appears bright silver or gold, appearing as if they are made of metal, hence the name Metal Balloon. In fact, this type of balloon is made of aluminum foil, a thin metal sheet material, which also has some characteristics of aluminum foil, such as being not easy to break, having a smooth and glossy surface.

With the increasing awareness of environmental protection, the environmental protection and sustainable development of decorative balloons have also received more and more attention. In order to reduce the impact on the environment, many manufacturers have started using biodegradable materials to make balloons, reducing the pollution of waste to the environment. Meanwhile, some event organizers have also begun advocating for the reuse of balloons to reduce waste.