I am 11 years old and I bought this product to write down ideas that were overflowing in my head! I really like this product, it is vey quirky and humorous. It's 1.3cm thick, which is perfect, although the front cover and back cover are 0.2cm each, but that's fine! It's 14.8cm high and 10.4cm long, pocket size (if you have a big enough pocket). The pages inside are lined and blank. The left side is blank and the right side is lined, which is great so you can draw a picture and write. I really love this notebook!