Ufo near hwy 510 between Roy and Spanaway Wa.

We were driving on hwy 510 towards Spanaway, Washington. I happened to look out my window (passenger side) and a bright, reflective object in the sky caught my attention immediately.A large, saucer/disc shaped object was hovering well above the treeline. It was a clear sunny day, no clouds, aircrafts, or other objects in sight. It appeared to be silver or chrome like in color, and as I said, very reflective. It stayed hovering approximately one minute from when I first saw it, then it disappeared. There was no visible flight path or direction, it just vanished.