name is bento box.... it is very easy... you start with the small block in the centre and add another block to it the same size, then the next strip is the length of those two and so on and so on.... just have a good look at the pictures and you will get it...the little block is two and a half inches, do two of those... the next strip to that is four and a half inches, then six and a half inches and if there is another one it will be eight and a half inches.. all two and a half inches wide... use your jelly rolls... they are great for that.