I was after a cloth that was similar to the one which comes with the iPad 1. It is about 2/3 the width of the iPad screen (which is not a problem), but is slightly thicker and not as soft or as good as the Apple cloth for cleaning finger prints. the size is 15.5cm x 16.5cm . The iPad screen is approx 22.5cm x 17.5cm
I bought 3 of these thinking they would be of a decent size - but they are only good for camera lenses or glasses and therefore poor value. Bigger (30cm square) and thicker cloths are available at similar prices on Amazon.
Very good product, but as will any cloth it is important to understand how to use it. Depends what the surface you are cleaning is dirty with. I used it on my DSLR and I usually use a blower before touching the lens, then I use two different cleaning cloths and usually the blower again at the end. This cloth is very good quality and priced very well too.