Troika Ballpoint Micro Refill

• Length: 44.5mm (1.75″)
• Manufacturer’s website: Troika USA

The Troika micro ballpoint refill is designed to fit in their keyring pens. This is the smallest ISO D standard refill. This refill comes with a threaded, knurled rear knob, but that can be removed. This refill is available in black ink in a medium line width.