kwmobile®Praktisches 12er Dust Kit for the Apple MacBook Pro 13 "15" Retina / Air 11 "13" in black to protect against dust and dirt (Electronics)
An for the Dust Cover Kit is a great idea, this holds only for a brief moment, you take the PC on your lap or places it on the sofa, the rubber pads are directly back out. Although they are really cheap, but the good is nothing.