If you want to take it with you on the go so that children don't lose the pen, it can have a strap to prevent it from getting lost. If you are very sensitive to smells, you may be able to smell it when you color the book. Some chemical reaction makes that smell? Overall, this is a good water coloring book for kids. My kid only likes one of these three books but it was a good buy. Overtime, book creases from water
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