Small but does the job
I have the super fine one in blue. It is the highest grit I currently have and I like to use it to touch up my knives and remove less steel in the process. Yes it is small but it is effective. It is mostly handle with maybe an inch and a half or something of actual stone. With my experience using the blue one and knowing this product gives you the 3 levels of grit to use, this would be a good portable option for people wanting to sharpen small to medium sized knives.