The case you have on your picture can’t possibly make those marks you show us.
The case is open and there has probably been something harder than aluminium in a pocket or case that made these marks when carrying them together.
And there is no metal to buy that can be coloured all the way through like you would like it to be.
That is something that has not been invented yet.
I got some small marks like those on my iPhone 7 because there has cone particles of metal and sand between the case and phone in my work as a service technician.
Nothing much to do about it other than I should have gotten a LifeProof instead from the beginning like I had on my iPhone 5 and 6.
They both look brand new when I removed the case after 2 years and gave them away.
The 5 has a new LifeProof and still look like new when we had it out a while ago. [emoji1360]
Next time I think I will try a silver coloured iPhone and that way scratches will be hard to see. [emoji6]
The case is open and there has probably been something harder than aluminium in a pocket or case that made these marks when carrying them together.
And there is no metal to buy that can be coloured all the way through like you would like it to be.
That is something that has not been invented yet.
I got some small marks like those on my iPhone 7 because there has cone particles of metal and sand between the case and phone in my work as a service technician.
Nothing much to do about it other than I should have gotten a LifeProof instead from the beginning like I had on my iPhone 5 and 6.
They both look brand new when I removed the case after 2 years and gave them away.
The 5 has a new LifeProof and still look like new when we had it out a while ago. [emoji1360]
Next time I think I will try a silver coloured iPhone and that way scratches will be hard to see. [emoji6]