Is this pen refillable?

The material does not say. It describes a plunger-action pen with a rubber grip and gives no refill information, so treat it as a disposable promotional pen unless the seller states otherwise.

Does it come with custom printing?

It is sold as a promotional pen, which usually means the buyer adds a logo or message. The material does not describe printing options, so confirm the branding process with the seller.

Is it good for everyday office use?

Yes. It is a standard retractable ballpoint with a rubber grip, which is comfortable for routine note-taking. It is a basic pen, not a premium one.

How does it compare with a branded retractable pen?

It offers the same core features, a rubber grip and a push-button mechanism, in a simpler build. Branded pens typically have sturdier bodies and refills; this one is built for volume giveaways.