A bar that is made out of high impact plastic, that is twenty-five millimetres square and at least 30 centimetres long and has embedded magnet.
Source
http://www.search.e-laws.gov.on.ca/en/isysquery/c98f5d31-5d2e-47d2-9c41-a7930ae33eef/9/doc/?search=browseStatutes&context=#hit1