This is a 10" (25cm) block.
It is more intermediate but definitely not very hard.
From now on my blocks may start to look a little different. My husband bought me a EQ7 programme and now I can design a lot more and add a lot of different colours and colour fabrics to my blocks. Jeepers, this software is Awesome! The 2% that I can do at the moment is already so much more than my old programme I was working off.
This even shows a layout of the blocks in a quilt.