Michigan Compiled Laws, Chapter 324. Natural Resources and Environmental Protection § 324.16102

Sec. 16102. (1) All plastic products sold in this state shall be labeled with a code indicating the plastic resin used to produce the product. The code shall consist of a number placed within a triangle of arrows with letters placed below the triangle of arrows. The triangle shall be equilateral, formed by 3 arrows with the apex of each point of the triangle at the midpoint of each arrow, rounded with a short radius. The pointer or arrowhead of each arrow shall be at the midpoint of each side of the triangle with a short gap separating the pointer from the base of the adjacent arrow. The triangle, formed by the 3 arrows curved at their midpoints shall depict a clockwise path around the code number. The triangle of arrows shall be not less than 1/2 inch high or if the plastic product is designed so that a triangle or arrows of not less than 1/2 inch height cannot be added to the product, a smaller label may be used if the label can be easily read. The code shall appear on or near the bottom of the plastic product as follows:

(2) The department shall maintain a list of the label codes provided in subsection (1) and shall provide a copy of that list to any person upon request.