KinderBike Laufrad 2015 Bike, Yellow LIMITED LIFETIME WARRANTY - The best warranty in the industry Extremely lightweight and sturdy, 6061 Aluminum alloy frame (roughly 3.8kg) Lightweight aluminum frame that won't rust - EVER Handlebar adjusts up-down & forward-back to allow for a custom fit for your child Twin-bearing steel headset (not plastic) ensures smooth steering without binding