We find that a ton of pens will work great inside our pen, after yours arrives you can have fun finding even more refills that will work. When you find more that work, please send us an email so we can built a complete master list.
The surface is extremely durable. To give you a good comparison the surface color/coating is very durable like the metal band around the new iphones. Anything can get scratched if you try hard enough, but we spent over 2 months perfecting this finish to make sure they will look great for many years. Trust us, it's nice.
Titanium is 30% stronger than Steel but nearly 50% lighter. It's truly an great balance between weight and strength. Our pens use TA4, which is the highest strength of unalloyed titanium. It is highly corrosion resistant and will be around for many years to come.