It has a lightweight magnesium alloy frame with zero welding, extra-thick tires that come complete with a set of training wheels. This BMX bicycle is equally good for both boys and girls. Our BMX bike is complete with a set of training wheels for beginners. With the training wheels, your kids won't fall over the bike while learning to ride. Also, even if an experienced child falls over, the lightweight material of the bike minimizes the risk of any serious injury. Most of the bike comes pre-assembled in the package. However, you may need to install training wheels (optional), pedals, handlebar, and seat.