Bathroom Riho Balbao
A freestanding bathtub with a solid oval-shaped surface with internal drain and pull-out tray.

The file contains the entire size range of bathtubs:

Riho bilbao
1700x800x550mm
https://riho.com/en/product/bilbao/ 

Riho bilbao
1500x750x550mm
https://riho.com/en/product/bilbao/ 

Models for smoothing. Apply smoothing modifier.

Who works in the V-Ray version lower than 3.1 be careful in the materials in the BRDF section there is Microfaset GTR (GGX) if your version is older than 3.1 then the BRDF field will be empty. Choose Blinn Phong or Ward – which is preferable for you.

For Corona render it is recommended to install version no lower than 1.5 since the glossiness of materials is adjusted taking into account PBR