Ravi, 28, Mumbai, needs a water-resistant pen for monsoon note-taking.
Uses Signo Knock daily; water-resistant ink prevents smudging during heavy rains, lasts 1-2 months, saving ₹ on frequent replacements.
You save 420 (26%)
Estimated doorstep delivery by 12 Dec - 25 Dec from USA





Premium USA-Quality Ballpoint Pen at Competitive Price
The 三菱鉛筆 Uni Ball Signo Knock Ballpoint Pen RT1 is a refillable, water-resistant writing instrument designed for consistent performance in India’s humid climate. Its 0.38mm tip delivers precise, smooth ink flow, ideal for professional and academic use. The pen’s contoured grip ensures comfort during extended writing sessions, while its plastic body keeps it lightweight and portable. Imported directly from the USA, it arrives factory-sealed, with all customs duties paid, ensuring authenticity and quality. Reviewers highlight its durability and consistent ink flow, making it a preferred choice for students and professionals alike.
Its water-resistant ink resists smudging and running, even in monsoon conditions, while the refillable feature reduces waste and cost per use. The pen’s round shape and contoured grip provide ergonomic comfort, suitable for ambidextrous users. Delivered via ExpressBox, it reaches your doorstep in 27-40 days, ready for immediate use. Whether for note-taking, exams, or daily office work, this pen offers reliable performance and value, backed by US manufacturing standards.
Superior Performance with US-Imported Quality
The Uni Ball Signo RT1 is manufactured in the USA, ensuring high standards of ink quality, durability, and consistency. Its water-resistant ink and refillable design make it a reliable choice for Indian users facing humid conditions. The pen’s ergonomic grip and precise tip support smooth, detailed writing, outperforming local alternatives that often smudge or run in monsoon weather.
Ideal for Professionals, Students & Teachers
This pen suits daily office use, school assignments, and exam prep. Its refillability reduces costs over time, and the water-resistant ink ensures legibility in humid environments. Skip if you prefer disposable pens or need a thicker line; this is optimized for fine, precise writing.
Typical situations where 三菱鉛筆 Uni Ball Signo Knock Ballpoint Pen RT1 0.38mm | Refillable helps — illustrative scenarios, not customer reviews.
Ravi, 28, Mumbai, needs a water-resistant pen for monsoon note-taking.
Uses Signo Knock daily; water-resistant ink prevents smudging during heavy rains, lasts 1-2 months, saving ₹ on frequent replacements.
| Ink Type | Water-based, water-resistant |
| Tip Size | 0.38mm |
| Refillable | Yes |
| Recommended Use | Daily writing, note-taking, professional documents |
| Reapplication Math | Refill lasts for hundreds of pages, approx 1-2 months with daily use |
| Shelf Life | Factory-sealed, indefinite; use refill cartridges within 12 months |
| Contraindications | None |
| Allergens / Irritants | None |
| Feature | 三菱鉛筆 Uni Ball | Others |
|---|---|---|
| Ink Resistance | Water-resistant, smudge-proof ink, tested in US labs | Standard ink prone to smudging in humidity, no water resistance |
| Refillability | Refillable with official cartridges, reduces long-term cost | Disposable, needs frequent replacement, higher ongoing expense |
| Tip Precision | 0.38mm fine tip for detailed writing | Thicker tips, less precise for fine work |
| Durability | Manufactured in the USA, tested for durability | Variable quality, often less durable in humid conditions |
| SKU | suq1788 |
| GTIN | 04902778142677 |
| Brand | 三菱鉛筆 |
| Size | 1 Count (Pack of 1) |
| Material | Plastic |
| Color | Blue Black |
| Country of Origin | United States |
About 三菱鉛筆
三菱鉛筆 is a leading Japanese brand known for high-quality writing instruments, trusted worldwide for durability and precision.
Compliance & Legal
This is a writing instrument; no medical or health claims. No certifications required. Ensure proper storage; ink may dry if uncapped for long. No condition claims.
Share your experience
Bought this from CrowCrowCrow? Other buyers want to hear how it went.

This item:
三菱鉛筆 Uni Ball Signo Knock Ballpoint Pen RT1 0.38mm | Refillable, Water-Resistant, Blue Black Ink
1,210

This item
三菱鉛筆 Uni Ball Signo Knock Ballpoint Pen RT1 0.38mm | Refillable, Water-Resistant, Blue Black Ink
1,210
Total price:
8,380
You save 2,520 (23%) Extra3 items selected
3 items
8,380You save 2,520 (23%) Extra
| Attributes | Current ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
|---|---|---|---|---|---|---|---|
| Spec | |||||||
| Price | 1,210 1,630 | 5,700 7,750 | 1,470 1,520 | 2,840 2,950 | 1,520 2,430 | 2,39,640 3,39,310 | 8,250 12,950 |
| Brand Name | 三菱鉛筆 | BIC | BIC | BIC | BIC | msi | Mutualsign |
| Source | US Retail | US Retail | US Retail | US Retail | US Retail | US Retail | US Retail |
| Sold By | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow |
Why shop with us
One price. One payment. No surprises.
High risk
Buying Direct
Crowcrowcrow
Safe Lane