2 White discs spotted near my home in West Chester Pennsylvania

It was a very clear day, no clouds in the sky so i could see nothing but blue sky above me. And out of nowhere 2 white discs appeared in the sky, they remained in the sky for about 10 minutes then slowly faded into the sky. These are not your stereotypical UFOs, these UFOs suddenly appeared in the sky, then slowly materialized away. I was on a walk at the time and accidentally left my phone at my home, so I ran home and called the sighting phone number on the website.