12" x 3" Rectangular Ground PlateEarthen or ground plates are a necessary interface between on board electronic devices and the heat sink: water.Glomex earthen plates are made of golden sintered bronze, that is, they consist of a million microspheres creating a surface 10 times greater than the actual one.They can have either a rectangular or a circular shape, and are fastened to the hull by means of bronze bolts and nuts, are highly resistant to corrosion, and include rubber spacers.The exclusive shape offered by Glomex assures a larger surface area and better strength.WARNING: This product can expose you to chemicals including LEAD which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.