This is the VILTROX mount adapter EF-R2, featuring a metal mount and electronic contacts. - Brand: VILTROX - Type: Mount adapter (for Canon EF to RF conversion) - Features: Metal mount, with electronic contacts Thank you for viewing. I am selling this because I no longer need it. I used it with an EOS R8 for about two years, and it's in good condition with no noticeable scratches. Autofocus and in-lens image stabilization work without any problems, and it was functioning normally. However, the control ring cannot be configured, but it seems that this can be fixed with a firmware update. (I'm sorry, I don't know how to do it.) The original box, instruction manual, warranty (expired), and two lens caps are included. Genuine mount adapters are expensive, but this compatible product offers good value for money. Thank you.