Great product, my 2 year old showed amazing improvement in pencil control after just using it for 2 days. We've had it a week and she always hold pencils, markers, pens, etc correctly now, due to this book! I would definitely recommend only using an erasable pencil. We erase it every time she wants to use it again. I'm considering pulling the pages out and putting them in plastic sleeves so she can use an erasable marker on it, to eliminate all the erasing I have to do!