Magnesium alloy is the reason this weighs 8 lbs rather than the twelve or thirteen a steel balance bike of the same size usually does. That difference decides whether a child rights the bike themselves after a stumble or waits for an adult. The handlebar rotates a full 360 degrees so a fall does not bend anything, the seat clamp locks positively at each height, and anti-puncture pneumatic tires cushion rough ground. Suits a 14 in to 16.5 in inseam from 36 months, rated to 66 lbs, and arrives 90 percent assembled with the tools included.