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The Sank Magic Practice Copybook (4 Pcs Set) guides pen strokes through 3D indented grooves for handwriting and math. With heat-sensitive ink, pages clear within 30 minutes for infinite reuse. This 500g preschool stationery set includes four books and five pen refills.
Key Features
- Auto-Disappearing Ink: 10 to 30 minute fade duration with disappearing ink. Pages stay clean for indefinite daily reuse.
- 3D Groove Design: Deeply indented 13.5x19 cm cardboard channels using 3D technology. Under the groove system, pen tips track correct stroke patterns.
- Thick Cardboard Material: 500g total set weight using durable, smudge-resistant paper. Despite heavy pressure, the surface resists tearing.
- Full Practice Set: 4 books, 1 pen, and 5 replacement refills. Within the set, children practice calligraphy and math.
Frequently Asked Questions
How long does magic ink take to disappear?
The ink fades fully within 10 to 30 minutes depending on humidity. Air moisture levels dictate the exact evaporation speed.
Is magic practice book good for 3 year olds?
This set builds fine motor skills in children aged 3 plus. Physical grooves provide tactile feedback for early writing development.
