Taschen is German for "pockets" (or "bags"). Paperback in German is "Taschenbuch", literally "pockets book". This title was very confusing to me.
I am suspicious as to whether you have ever seen a taschen brand book before. They are not trade paperback size, they are coffee table books. According to Amazon they tend to be in the 500-600 range.
8cm x 11cm = 3.14in x 4.33in
8in x 11in = 20cm x 28cm