It's white and yes filled with black epoxy, didn't come with a cover, they may have forgot? Gonna try it today, it is small, so now I have a big and a tiny, would of preferred a medium 7 or 8 inch round but for what I'm gonna use this for; dense trash this should be about right. From what I understand, it's a concentric, you'd think at this small size it would be a double d, Who's overlapping strokes of a 6 inch oblong coil by 50%? Guess I will be if it starts finding nice targets in trash. Maybe, just maybe, they know something that I can't figure out. We shall see. I'll let you know how it goes with my limited understanding of the F75.