These plastic-bodied refills feature Pilot's low-viscosity Acro hybrid ink, which combines the vibrance and consistency of gel ink with the quick-drying and water-resistant properties of ballpoint ink. They are compatible with the pens listed under Compatible Products.
Q: What is the difference between the BRFN-10 and BRFN-30 refills?
The BRFN-10 and BRFN-30 refills are also slightly differently shaped, so that not every pen that is compatible with one is necessarily compatible with the other. Make sure to check the Compatible Products and Recommended Refills links to make sure that the refill you choose is compatible with your pen. Both refills use Pilot's Acro hybrid ballpoint ink and are otherwise similar in performance.