4 piece hand writing practice books with pen sank books each book has a detailed description of how to hold the pen, and a silicone handwriting aid is provided to facilitate children to master the method of holding pen. the copybooks have three-dimensional grooves template design,which is convenient for kids to master writing. the paper is thick and not easy to smudges. great for kids writing. reusable copybook drawing toys for children montessori pen control training writing sticker learning educational toy kids gift.