Uni Signo RT Gel Ink Pen Ultra Fine 0.38mm Black Box of 12
Uni Signo RT Gel Ink Pen Ultra Fine 0.38mm Black Box of 12
Uni Signo RT Gel Ink Pen Ultra Fine 0.38mm Black Box of 12
Uni Signo RT Gel Ink Pen Ultra Fine 0.38mm Black Box of 12
Uni Signo RT Gel Ink Pen Ultra Fine 0.38mm Black Box of 12
Uni Signo RT Gel Ink Pen Ultra Fine 0.38mm Black Box of 12
Uni Signo RT Gel Ink Pen Ultra Fine 0.38mm Black Box of 12
Uni Signo RT Gel Ink Pen Ultra Fine 0.38mm Black Box of 12
Uni Signo RT Gel Ink Pen Ultra Fine 0.38mm Black Box of 12
Uniball

Uni-ball Signo RT UMN-138 Gel Ink Rollerball Pen 0.38mm Black Box of 12

$39.28 inc GST
$39.28 inc GST
RRP $41.25
Or 4 payments of $9.82 with
Add items to a quote for bulk pricing, approvals, or purchase orders.

SKU: UMUMN138BK

UPC: 4902778926420

MPN: UMN138BK

Black Gel Ink Pen With A 0.38mm Tip

This is the black version of the uni-ball Signo RT UMN-138 gel ink pen, with a 0.38mm tip.

uni-ball names the pen Signo RT, gives the tip as 0.38mm and sells it by the box of 12. Signo is uni-ball's gel ink pen family, and a 0.38mm tip lays a fine line for small, precise handwriting on forms, notes and printed pages.

Black is the default for forms, contracts and anything that will be scanned or photocopied. A 0.38mm tip as listed is a narrow line, which suits small handwriting, tight form boxes and margin notes. It is sold by the box of 12, so an office or school is stocked in one order.

The blue, red and blue/black versions sit alongside it in gel pens. The rest of the uni-ball range is at uni-ball, other pen types at pens, and notebooks, pads and the rest of the desk at writing supplies.

Often ordered together

  • Black ink, the default for forms and anything that will be copied
  • 0.38mm tip
  • Signo RT, as named by uni-ball
  • Gel ink pen from uni-ball's Signo range
  • Box of 12
  • Completing forms with small writing boxes
  • Margin notes and annotation on printed pages
  • Everyday notes, minutes and sign-off
  • Offices and schools that buy pens by the box

Shipping

Shipping is kept simple with flat rates for selected areas and free shipping where applicable. Large, bulky, rural or out-of-area orders may require additional freight, and our team will contact you if this applies. For a more specific estimate, simply add this product to a quote or visit our shipping page.

Delivery Times

Melbourne, Sydney, Brisbane, Adelaide — 1 to 3 business days
Perth — 1 to 5 business days
Regional & Outer Areas — 3 to 7 business days

Returns

If you have questions about returns, please contact us or visit our returns page for full details.

Specifications

Brand: uni-ball

Range: Signo RT

Manufacturer Code: UMN-138

Mega Code: UMUMN138BK

Colour: Black

Tip Size: 0.38mm

Ink Type: Gel ink

Pack: Box of 12

Barcode: 4902778926420

Primary Distribution Centre

Factory 5, 12 Greenway Drive
Tweed Heads South NSW 2486

ABN 18 634 002 609

Get directionsContact us

FAQs

0.38mm, as described by uni-ball for the UMN-138.
One box of 12 uni-ball Signo RT UMN-138 gel ink rollerball pens, all in black ink, each with a 0.38mm tip.
A narrow 0.38mm line suits small handwriting, tight form boxes, margin notes and annotation between the lines of printed pages.
The Signo RT UMN-138 is listed in black, blue, red and blue/black, each sold by the box of 12.
The Signo RT1 UMN155-038 is also listed at 0.38mm in uni-ball's 2026 catalogue. It is retractable and sold by the box of 10.

Shipping & Delivery

Delivery time depends on your location, the size of your order, and the shipping option selected at checkout. For in-stock items, standard metro delivery in QLD, NSW and VIC is usually 1 to 7 business days. South Australia, Tasmania, Western Australia and the Northern Territory are generally 3 to 12 business days. Express delivery for eligible parcels under 3kg is usually 1 to 4 business days in QLD, NSW, ACT and VIC. Delivery estimates apply to in-stock items only and may vary due to carrier conditions or delays.

If you need to make a change to your order, please contact our team as soon as possible. Once an order has been processed or dispatched, changes may no longer be possible. You can contact us through our Contact Us page for assistance.

Mega Office Supplies ships orders Australia wide and occasionally internationally. The best avenue would be to contact us so we can customise a specific quote for you. Please note that associated international duties, taxes and levies will be the responsibility of the customer.

Returns, Refunds & Replacements

Mega Office Supplies accepts change-of-mind returns for unopened and unused products within 14 days from the invoice date, provided the item is returned in its original packaging and in resalable condition. Original shipping costs are not refundable, return shipping is the customer’s responsibility, and a restocking fee may apply depending on the product type and supplier. Some items, including electronics, assembled or installed furniture, food, beverages, medicines, custom-made products, and certain bulk or special-order items, are not eligible for return unless required under Australian Consumer Law.

If your order arrives faulty, damaged, or incorrect, please contact Mega Office Supplies as soon as possible. Where required under Australian Consumer Law, a repair, replacement, or refund will be offered. In these cases, Mega Office Supplies will cover reasonable return shipping costs, and photographic evidence may be requested to help process the claim. Items should be reported within a reasonable timeframe after delivery.