For full functionality, we recommend downloading the source format.The converted file is intended exclusively for browser preview. In the source file, the following are fully preserved:✔ native scene structure✔ complete materials without reduction✔ proper texture maps✔ proper object namingIf you plan to use this model in production, download the original version.The U type Stairs are made of two types of wood and hidden illumination of each step. The railings are made of glass