Please examine the photos as you will need to check your spider shape! I’m sure this is a Shimano Ultegra FC-R8000 11-Speed Chainring. It is stamped Shimano Ultegra 53-39 MW. Very light use but too big for my partner to push. It was used with a 36T inner and actually this worked well. I’m throwing this in with the 53T but it’s upto you if you want to use it. And it’s not officially part of the sale.
eBay