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**Product Specifications:**

**Brand:** DuoLi Doctor

**Product Name:** VIKKO

**Types:** Double-line book, English book, Composition book, Exercise book

**Size:** 22K 157mm x 207mm

**Pages:** 20 pages inner content + 2 pages cover

**Material:** 80g colored offset paper

**Packaging:** 5 books per pack

**Printing:** Double-sided printing, beige color

**Features:** PVC cover, wear-resistant, waterproof, eye protection

**Specifications:** 20+4 sheets per book, 20 inner pages + 2 covers + 2 PVC covers

**Additional Information:** Hand measurements may have a tolerance of ±1.5mm

**Usage:** Smooth writing experience, suitable for long-term use without eye fatigue

Please note that the provided information is based on manual measurements and may have slight variations.