**Product Specifications:**
**Brand:** Genvana
**Product Name:** Dual Line Drawing Pen
**Model:** G-09903
**Specifications:** 12 pens per box
**Size:** 136mm
**Tip:** Dual-tip
**Ink Color:** Black
**Line Width:** 0.3mm
**Product Information:**
Suitable for architects' exams, ideal for drawing double lines
Ink does not fade easily
Hand measurements, with a normal error range of ±1-2mm
**Details Presentation:**
Features dual-line and dual-tip design
Ideal for drawing double wall lines and gaining an edge in exams
Comfortable to hold with a rounded pen body
**Additional Features:**
Ink colors available in 0.1mm, 0.3mm, and 0.5mm
Convenient pen clip for easy carrying
**Real Photography Show:**
Detailed images showcasing the product
**Warning:**
G-09901, G-09903, G-09905 are the model numbers for the Dual Line Drawing Pen
**Note:** Genvana is the brand name mentioned as Genvana in the text.