See trought material bug

Hi! I am making a 3d game in unity and when i import a model from blender to unity some of its parts are see throught.
Does anyone have the same problem or a solution?

this is it in blender:Imgur: The magic of the Internet
and in unity:Imgur: The magic of the Internet

thanks!

Your normals are inverted.
Unity only renders the front faces of a polygon not the back face.
A good way to see how it going to look in unity is to enable backface culling in blender.

Thanks!