GatorCases Stretchy Keyboard Dust Cover; Fits 88 Note Keyboards (GKC-1648),Black

What Color is it black or gray?

Would this cover fit a Roland Atelier AT-15 organ? The top measures 48" (W) x 19" (D) x 6" (H - rear), tapering to 3" (H - front).

Is this a "bag" style that requires that the keyboard be removed from it's stand to insert or cover?

Does it fit Roland RD-800, 88 keys ?