Attributes

Brand	-
Category	Stationery, Educational Electronics & Office Supplies / Technical Pens
Origin	-
Brand	IERS
Series	302 Technical Pen Series
Item Count	9 Pens per Set
Ink Type	Waterproof Pigment Ink
Tip Material	Stainless Steel
Line Widths Included	0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.8mm, 1.0mm
Ideal For	Anime Sketching, Architecture, Illustration
Cap Design	Snap-on with Air-tight Seal
Body Color	Matte Black with Silver Accents
Package Weight	180 grams

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Truly waterproof

I tested these with alcohol markers and watercolors, and the ink did not bleed or smear at all. The variety of sizes in this 9-pack covers almost all my needs.

Anonymous

Mar 15, 2026

Rating: 4/5

Great value set

Good quality for the price. The 0.05mm tip is incredibly fine, though you need a steady hand. One pen arrived slightly loose in the cap, but it still works fine.

Anonymous

Mar 15, 2026

Rating: 5/5

Consistent line weight

As an architecture student, consistent line weight is crucial. The IERS 302 series delivers perfectly uniform lines every time. The grip is comfortable for long drawing sessions.

Anonymous

Mar 11, 2026

Rating: 5/5

Best upgrade from my old set

Switched from a cheaper brand and the difference is night and day. No more clogging or fading lines. The stainless steel tips feel durable and premium.

Anonymous

Mar 07, 2026

Rating: 5/5

Perfect for my manga projects

These pens glide smoothly over paper without skipping. The waterproof ink is a lifesaver when I add watercolor washes to my illustrations. Highly recommend for any serious artist.

Anonymous

Mar 01, 2026

Rating: 3/5

Good but caps are tight

The pens write beautifully, but the caps are very tight. It takes a bit of effort to pull them off, which might be tiring if you switch sizes frequently. Otherwise, solid performance.

5 FAQ

Q: Does this set come with a carrying case?

A: Yes, the 9-pen set includes a sturdy plastic storage case with individual slots for each pen to keep them organized and protected.

Q: Is the 0.05mm tip durable enough for heavy use?

A: The stainless steel tips are quite durable, but extremely fine tips like 0.05mm require a light touch. Pressing too hard can bend the tip permanently.

Q: Can these be used on glossy photo paper?

A: While they work best on standard drawing paper or bristol board, they can be used on glossy surfaces; however, drying time may be slightly longer.

Q: Are these pens refillable?

A: No, the IERS 302 Series pens are designed as disposable units once the ink is depleted to ensure optimal tip performance and hygiene.

Q: What is the shelf life of the ink if left uncapped?

A: We strongly advise against leaving the pens uncapped. If left open for more than a few minutes, the tip may dry out and clog, affecting future performance.

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