3D Solutech See Through Red 1.75mm PETG 3D Printer Filament 2.2 LBS (1.0KG)

If I print something thin enough, do you think you would be able to see the interior decently? If not do you know any material that could produce

When the filament got here it turned out that it was flexible (tpu) filament with an amazon label that said petg do you actually sell petg filament?

Will this work to print a taillight?