- produced entirely in Italy, treated in detail with the use of true Italian leather. NOTE: The knob can reuse those already present in the car or you can buy them in our shop or request them The sale refers only to leather cap (the photo is purely illustrative). To mount the new headphones, just have some patience and a minimum of manual skills. Our products are carefully made to measure to be able to consent the assembly in your cars, all of course, having first tested the product on the support (ring) and original knob. This is not a spare part in any car spare parts store but a handmade handcrafted product. We remain at your complete disposal for any clarification on the matter but we do not accept complaints or disputes as everything is described in a clear and precise way on our sa.