Material:plasticColr:BlueOne Size:7.5cm x 4cm (L x W)*Warning: can not eat*For children， in the game at the same time， also can began to understand the knowledge of the green energy， and form the good habit of environmental protection as a child， at the same time develop ability by DIY.Note:1: how to make the salt solution: add the salt and water in 1 (salt) than 5 (water). Anything from 20% to 99% the proportion of salt water is feasible / but 20% would be most effective.2: salt water use after a period of time / the car will be slower and slower then stop. Then add salt water can start the car again.3: each anode sheet metal is consumables / may be oxidation / if erosion can't use / can replace a new anode sheet metal (product suite includes three anode sheet metal).4: if long time don't need salt water to drive a car don't use / need to clean the FC modules: rinse the cathode plate / the removal of anode residues on salt / dry all parts separately / otherwise it will shorten the service life of anode sheet metal.Anode plate must use water to remove the layer of the surface of the corroded / if said anode can be used in more than 20 times a day for a few days / if once in 1 to 2 times can use for several months / about 60 to 70 times or so