What is the material of the inner and outer supports of the hyperbaric oxygen chamber?

What is the material of the inner and outer supports of the hyperbaric oxygen chamber?

The inner and outer brackets are made of stainless steel spray plastic, which is solid and reliable in quality. The use of inner and outer brackets can keep the oxygen chamber three-dimensional even in the deflated state, making it easy to enter and exit. Generally, the inner bracket is white and the outer bracket is black.