Product Specifications at a Glance: Size, Weight and Refills

The slowest part of sourcing a full-metal pen is rarely the selection itself — it is asking model after model about size, weight and refill compatibility. This page lists all 13 models we currently offer, with figures taken from our product specification files rather than estimates.

The full specification table

Read the table first, the notes after. Items marked "on request" mean the published dimensions and weight for that model are confirmed case by case against the current production batch — we do not print figures we cannot substantiate.

Which refill does each model take?

This is the question buyers ask most, because whether a refill is a standard commodity decides your cost over the next three years.

• M&G G5/G7 standard refills — used by Dog 2.0, the Standard and N / NS / NSN pen-bay pens, Dabao, Wuzhu, Pu, Mermaid, Xiaobao 2.0 and 3.0, and the Relief pen 3.0. Available at stationery shops and mainstream e-commerce, commonly in black, blue and red.
• M&G miniG5 short refills — used by Xiaobao mini, Erbao and the Shaohua lipstick pen. Also standard, but shorter than the G5/G7; check you are not buying the long version.
• Equal-length body design — Xiaobao mini and Xiaobao 3.0 are built to the same length as their refill, which is how they stay compact enough for 81.6 mm and 112 mm overall.

Weight and how it feels in the hand

Heavier is not better; it depends on the use case. Our own reading: 13 to 22 g suits everyday office writing, the lipstick and mini models sit at 9 to 18 g, and the Relief pen reaches 14 to 21 g because of its internal weight.

One comparison is worth making explicitly. Dabao at 142 mm and approx. 22 g pairs a 304 stainless barrel with high-strength aluminium, while Wuzhu at 132.8 mm and approx. 16 g is one-piece stainless including the clip. Two material routes in the same price band, and the feel difference is real. If signing documents is the main job, take Dabao; if you write for long stretches, Wuzhu is lighter.

Material breakdown: why one pen lists two materials

BTST products are typically a steel-and-aluminium combination rather than a single metal. It is a division of labour, not convenience: stainless carries corrosion resistance and structural strength, aluminium brings low weight and takes anodized colour. Dog 2.0 is a solid 304 stainless bay and barrel with an aluminium tip and tail; Mermaid and Pu are aluminium bodies with 304 refill mechanisms.

Worth noting that anodized aluminium and plated stainless are different processes. In anodizing the colour grows inside an oxide layer formed from the metal itself, while plating sits on the surface — they weather differently and fade differently.

Parameters we have not finalised

To avoid misleading you, the following are still open in our documentation and will be confirmed item by item in writing when you enquire: the published dimensions and weight of the pen-bay family (Dog 2.0, Standard, N / NS / NSN); what distinguishes the 18 g and 24 g versions of the Mermaid; the exact refill model fitted to the Mermaid; the standard price of the Dog + notebook set. Wuzhu also carries two measured lengths, 132.8 mm and 136.6 mm, with the physical sample as the reference.

Stating this plainly matters more than filling every cell. What you need are numbers you can put in a contract.

How to use this table

Once you have chosen a model, send an inquiry stating your quantity range, whether you need engraving, custom colour and packaging, and we will quote against process complexity and volume. In-stock wholesale starts at 1 piece; customization and OEM at 100 pieces. Unit price and lead time are set out in the formal quotation and contract.