THESE ARE PLASTIC COVERS THAT GO OVER THE BACK OF YOUR PHONE TO CHANGE THE CAMERA

UK SELLER, FIRST CLASS POSTAGE, FAST DISPATCH 
 

If you buy the X/XS then your phone will look like an 11 Pro 

If you buy the XS Max your phone will look like 11 Pro Max 

If you buy the XR your phone will look like the iPhone 11.