Material：High-quality waterproof PU leather. Cover size: 18.5cm×13.5cm / (7.3" x 5.3") Paper inside size: 17.2cm×9.5cm / (6.8" x 3.75") The amount of paper：110 sheets/ 220 pages Refill Notebook Lock diary can refill new pages Password Open Method： ① The origin passcode of the notebook is 000 ② Sliding to the left button, you can open the notebook. Password Modification Method： ③ Please push the button to the right when the passcode was right, then you can change the passcode, please do not releases the button until you set the new passcode. ④ Set up a new password, and then release the button, the new password is set. please remember your new password SERVICE GUARANTEE: Your satisfaction is our goal of service. If there is any problem with the item after you get it, please free to contact us, we will try our best to resolve all the problems for you.