KACO x Guozijian JUMBO 0.5mm Black Retractable Gel Pen, Quick-Dry Carbon Ballpoint Pen for Middle School Students, 4-Pack

Product Specifications:

Brand: KACO

Product Name: JUMBO Large Capacity Retractable Gel Pen Set - An Ying Fu Jin (Confucius Temple and Guozijian Museum Co-branded Edition)

Model: An Ying Fu Jin Series

Pen Type: Retractable gel pen

Ink Color: Black

Tip Size: 0.5 mm

Writing Length: Approximately 1800 meters per pen (±10%), equivalent to 4.5 times the national standard writing length (GB/T37853-2019), capable of writing about 45 essays of 800 words each

Ink Features:

Smooth dual-ball ST tip technology for stable and fine writing experience

Quick-drying ink tested with 3-second dry time under standard conditions

Deep black ink with clear and sharp strokes, suitable for computer scanning and important exams

Pen Body:

Transparent orange color

Material: Polycarbonate and silicone

Streamlined fish scale pattern inspired by traditional Chinese koi carp motifs symbolizing good luck and auspiciousness

Soft silicone spray-coated grip for enhanced comfort and easy cleaning

Dimensions:

Length: 146 mm

Diameter: 12 mm (pen body), 16 mm (grip area)

Packaging:

Set of 4 pens per box

Includes co-branded custom bookmark featuring the "Dragon Gate Koi" design

Quality Standards:

Complies with Q/KACO000401-2022 and GB 21027-2020 standards

Precision injection molded integrated oil tube refill to minimize ink leakage risk

Strict factory quality control

Additional Features:

Developed by Shanghai Wencai Industrial Co., Ltd., established in 2011 in Shanghai, China

Award-winning minimalist modern design philosophy

Dual-ball ST nib allows smooth writing at lower angles (~48°) compared to conventional single-ball nibs (~60°)

Ink drying tested on GB/T12654 standard writing paper

Suitable for long-duration writing and exam use

Usage Scenarios:

Ideal for students, exams, calligraphy, and cultural gifting

Symbolizes good fortune and success, inspired by the "Koi Carp Leaping the Dragon Gate" motif

Note: Writing length data based on Shanghai Wencai Laboratory testing.