Best type of pen/ink for addressing invites?

I'm going to hand-address my invitations. I bought a template on for keeping the lines straight. For the people who hand addressed envelopes, what type of pen did

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4 Style addressing stencils and 2 style brush pens: 4 style designs include 4 same lines, 4 different size lines, 5 different size lines, 2 columns

7 Pieces Envelope Addressing Guide 4 Style Addressing Stencil Templates for Envelopes with 2 Size Brush Pens, Making Thank You Card, Festival Cards

Gejoy 7 Pieces Envelope Addressing Guide 4 Style Addressing Stencil Templates for Envelopes with 2 Size Brush Pens, Making Thank You Card, Festival

7 Pieces Envelope Addressing Guide 4 Style Addressing Stencil Templates for Envelopes with 2 Size Brush Pens, Making Thank You Card, Festival Cards, Wedding Invitations, Party Invitations : Home & Kitchen

Free Basic Envelopes & Address Printing

How to Address Wedding Invitations: Etiquette & Examples - Zola Expert Wedding Advice

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