The heat-treated 6061 aluminium frame is just as durable as a real mountain bike, but still the right weight for a child. Mechanically-formed tubes mean it's bang up to date in terms of technology, too. Kids geometry was tailored to the needs of young CUBE riders - it includes a very low top tube, which gives more freedom to move around on the bike. The derailleur hanger is also replaceable, because kids always want to test their limits.
6061 aluminium alloy requires a heat treatment for the finished product. It is a stiff, very corrosion resistant, fatigue resistant,high-elongation material suitable for light tubesets with high stiffness.