**Specifications:**
**Brand:** Dian Shi
**Product:** Writing instruments
**Focus:** Pens only, specializing in exam preparation sets
**Model:** DS-321E 9PCS
**Features:**
- Suitable for exams, practice, error correction, and marking
- Exam preparation set includes various pens for different needs
- Pens authorized by the China Pen Association
- "3A" anti-disturbance, silent click mechanism
- "2A" anti-smudge, quick-drying ink
- "4A" ergonomic design with triangular pen barrel
- "1A" smooth writing with dual-tip pen head
- "5A" stable writing with anti-shake pen tip
**Additional Information:**
- Original Chinese invention patent ZL202011217099.2
- Designed for exam preparation, study, and marking
**Included in Set:**
- DS-904: Needle-tip liquid ink pen
- DS-0163: Dual-tip click pen with black carbon ink
- DS-0176: Dual-tip quick-dry pen with red ink
- DS-805s: Clickable highlighter pen
- DS-827: Soft brush pen for marking
**Design:** Ergonomic and comfortable for long writing sessions
**Usage:** Suitable for various exam scenarios and study environments
**Certification:** Approved for exam use
**Patent:** ZL202011217099.2
**Package Contents:** 7 pens and 2 refills in exam preparation set
**Variants:** Sobt brush pen, Sott brush pen
**Compatibility:** DS-321E, DS-32IE, CPC9
**Color Options:** Black, red, gold, maple leaf, frost night
**Note:** Dian Shi specializes in producing high-quality pens for exam preparation, study, error correction, and marking purposes. The products are designed to provide a smooth writing experience and meet the needs of students and professionals preparing for exams.
