Mirroring sleeve in blender - losing texture/faces? [Solved]

I'm trying to duplicate & mirror a sleeve in blender. The vertices and edges came out fine when I copied & mirrored it.. But it looks like it lost its faces or texture or something? How do I fix this? Or is there a tutorial for duplicating and mirroring? It is UV mapped onto the texture, but it's not showing on all of the faces. Most of them are transparent. It's like the texture is inside out or something...

Here's the blend file.