56 pcs Good Quality Bricks The center of gravity of the upper part of the model makes all chains in tension thus forming a stable system that seems to overcome gravity. Manufacturered by Building Boat. ExperienceWith remote controller you can control speed and directions easily and conveniently. Full function of forward reverse left right and stop. Reminder: All parts are quality checked before shipping so if you find some missing or damaged parts don't worry. Please contact us and we will send them to you immediately free of charge. Instructions:Please scan the QR code on the package. If it is not available please contact customer service in time.