**Specifications:**
**Brand:** deli
**Product Name:** Carbon Black Exam Neutral Pen Refill
**Ink Type:** Imported upgraded carbon black ink
**Ink Features:** Quick-drying, resistant to smudging, high saturation
**Writing Length:** 400m
**Tip Material:** Tungsten carbide ball
**Ink Stability:** Improved formula for smoothness, viscosity, adhesion, and saturation
**Ink Concentration:** High carbon black content for clear and easily scannable writing
**Tip Type:** Tungsten carbide ball for smooth and durable writing experience
**Tip Size:** 0.5mm for moderate writing thickness and high scan recognition
**Cap Type:** Soft rubber cap for protection against ink drying and reusability
**Compatibility:** Suitable for various types of paper
**Additional Features:** Diamond-like carbonized tungsten carbide ball for durability and longevity
Note: The specifications mentioned above are based on the product description provided for deli brand pens.
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