Titanium is as strong as steel but 45% lighter, all while being unaffected by metal fatigue and cracking. These are the main reasons why titanium is used for parts that spend thousands of reliable hours in the air inside jet engines. Not only is it strong and light, but it has great corrosion resistance. It really is an incredible material.
Copper is one of the few metals that occurs in nature in directly usable metallic form as opposed to needing extraction from an ore. Copper on its own can be soft and dent easily, so by adding tellurium we make it stronger and easier to machine. It also offers natural antimicrobial properties for those worried about germy hands. Copper will patina over time.
Bronze has been used for centuries to make ship fittings and seafaring equipment and more recently found its place firmly in the high-end diving watch industry. It has a vintage-like matte patina, which differs from pen to pen depending on the owner's environment and lifestyle, making each pen beautiful in its own right. Its most outstanding property is its ability to resist corrosion even in seawater. Bronze weighs about 10% more than stainless steel. It reacts with oxygen, which results in its distinctive patina. This is the only bronze C52100 pen out there: a bronze typically reserved for high-end watches.
Stainless steel’s excellent resistance to corrosion and staining and low maintenance is why it's the most used material in the high-end watch industry -- making it a great choice for a pen.
Your stainless steel pen will keep its clean sleek look even in the harshest environments. The pen is not too heavy, but heavy enough to feel the heft of quality. It will not dull or patina over time. It is very easy to take care of and will become a trusted member of your life.