Excerpt from one article:
<...>Infrared safe class 1 protection is designed for installation at home or in the office, they have a light degree of protection. The body of such a safe is made of steel with a thickness of 5-10 mm. The frame is filled with a special solid concrete. The side walls have a thickness of 20-40 mm. Such a safe is ideal for hiding valuables from children, for example.<>

The good kids...