Hwy 510, Between. Roy and Spanaway Washington. Saturday, September 12th,2015, 10:12am (approximately) Driving on hwy 510 towards Spanaway, I looked out the passenger side window and saw a saucer shaped object hovering well above the treeline. Thete were no clouds, aircrafts, balloons,or any other recognizable objects in the sky at that time. The object appeared to be silver or chrome like in color, and highly reflective. It just hovered in one spot.I turned away for a few seconds to tell my husband (who was driving)and when I looked at it again, it was there for a few more seconds and then disappeared. No visible take off or flight path.