Thank you for viewing my products. Shipping within 24 hours is available! I purchased this book to improve my work skills. As shown in the photos, there is a crease on the cover. Please rest assured that the inside pages are mostly free of creases. I have discounted the price due to the cover crease. 1000 yen → 800 yen! Are you interested in NC programming, want to study it, or want to improve your skills? Why not?