Here is an exciting heading

This product has attributes, in this case in the form of a color and size selection. 

Each attribute 

can have an additional article number attached to the main article number,
it can have its own EAN 
it can have a surcharge to the product weight
it can have a surcharge on the product weight
it has its own stock.

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This product contains 3 liters of something.

The system automatically calculates how high the price per litre is - in other words, the legally required information.

This product is a FSK-18 product. That's why there is a separate label and there is no button "add to shopping cart".

However, since the neighboring product has such a button on the start page, in such cases (only in such cases) the box of the neighboring product may be larger than that of the FSK18 product. Normally, this does not happen because the boxes automatically adjust when loading the page.