6Al-4V titanium and its sibling 3Al-2.5V titanium alloy have many similarities, including density, strength, corrosion resistance, durability, comfort, and...”good looking”. The major difference, however, is tensile strength. 6-4 has 30% higher tensile strength than 3-2.5 titanium. Rikulau is honored to be the first Taiwanese brand to own a 6Al-4V titanium product. Our 6-4 tubes are Made in Taiwan, and every tube has gone through precision extrusion, shaping, precision cutting, and then, heat treatment to release stress to ensure a perfect frame quality.