Optimize entry

• Does this picture have an inappropriate or wrong description?
• Is an important keyword missing?
• Are there any inappropriate or falsely spelled keywords?

then please help to improve this entry. We thank you in the name of all Bilderkiste.de users.

Which keywords match the picture best?

keyword	rate			relevance
Tube				0%
Tubes				0%
Pipes				0%
Grey lines				0%
Grey				0%
Grey line				0%
Dividing lines				0%