Uni-ball Signo RT1 UMN155-07 Retractable Gel Ink Rollerball Pen 0.7mm Black

uni-ball's product page for the Signo RT1 does not publish a tip size at all, only the description 'Ultra fine retractable rollerball pen for precision writing'. The 0.7mm belongs to uni-ball's 2026 product catalogue, and that is where we have taken it from. We would rather say so than imply the product page carries it.

uni-ball does not publish a refill code for UMN155-07, so we are not going to name one. We do stock Signo retractable refills as separate items, but matching one to this pen is worth confirming against the pen in hand before ordering in quantity.

Yes. uni-ball states the retractable mechanism for this model on its own product page. That is not true of every pen in the Signo family, so it is worth saying plainly for this one rather than assuming it across the range.

We are not stating a count for this SKU. uni-ball publishes no pack size for UMN155-07, and our own records for these eight inks contradict each other, so rather than guess we have left it off the listing and flagged it for review. Ask us before ordering if the count matters to you.

No. uni-ball publishes no colour names as text for the Signo RT1 range, only a gallery of images. Black is the store's own name for this variant. The code and the barcode are the identifiers that will match a supplier's records.

uni-ball lists three codes under UMN-155: UMN155-07, UMN155-05 and UMN155-038. The catalogue puts them at 0.7mm, 0.5mm and 0.38mm. This is the widest of the three, so it lays the most ink; the narrower two suit smaller handwriting and tighter forms.

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.

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.