The hard-cover and big size graph book is designed to be used for biological and numerical subject classes where there is need to both write notes and draw graph(s) alongside, with ruled and standard graph sheets. The hard cover is to protect the notebook against the destructive effects of possible drops of chemical or other corrosive liquids when the notebook is being used in a lab.

The hard-cover and big size lab notebook is designed to be used in labs (for practical works/studies), or in science classes where there is need to both take notes and do drawings, with ruled and plain pages. The hard cover is to protect the notebook against the destructive effects of possible drops of chemical or other corrosive liquids.

The soft cover graph or lab note book is made available for an alternative choice to the hard cover.