Smilay magnets in 37mm. Can stick to any metal/steel surface.
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Buy this bundle with both Lean Games and the Supply Chain Game. Included is Lean Game FlowCar, Kit with 20 extra cars, Supply Chain Game with LEGO, eLean Game FlowBoat and eLean Game Office.
With this extra kit you have bricks for a total of forty cars. It eases the game play a little that you don't need to disassemble the cars during the game. Please note that this is NOT a complete FlowCar Lean game!