Combination of attributes

[maltit]

I need to combine two attributes, size and length.

The length in the same size is different for different products.

Example:

Product A with size S is 10.0cm length

Product B with size S is 12.0cm length

I need to combine these two parameters when creating a product.

On the product page I would like to display it in this way:

 

[maltit]

I have a solution, just combine the appropriate two attributes. The rest in the template