Mich. Comp. Laws § 500.4201

Sec. 4201. "Industrial life insurance," as used in this code, means that form of life insurance either (1) under which the premiums are payable weekly, or (2) under which the premiums are payable monthly or oftener, but less often than weekly, if the face amount of insurance provided in any such policy is $1,000.00 or less and if the words "industrial policy" are printed upon the policy as a part of the descriptive matter.