The H-fusion HFL-612 is made with Sun Platinum - it is an unique metal alloy from Japan since 1930. It consist of 85% nickel, 11% chrome, 3% iron, 1% other metals. It is extremely resistant to corrosion and just as strong as Titanium. It has been useful for eyewear, jewlery, and dental products. Its steadfast color remain brilliant even without intense polishing or maintenance. Due to increased commercial use of Titanium, making it harder and harder to come by. Sun Platinum has stepped up in the game of eyewear industry's manufacturing technology and became a popular material for frame production.