With endless options you can make all kinds of crazy machines and let the balls roll. With endless options you can make all kinds of crazy machines and let the balls roll. The Mega Ball Run contains special parts including tubes and X-shaped bars with 4 magnetic ends. The SmartMax magnets have the correct strength for their purpose and are made out of the the highest quality material that can be found. These magnets can carry up to 60 times their own weight. All parts can be combined with all existing SMARTMAX sets, creating an endless range of possibilities! Details:Plastic, Magnets, SmartMax bars have different colours as a code, Larger bars have stronger magnets than smaller ones | Smartmax Mega Ball Run | Michaels