46 C.F.R. § 160.047-2 Model.
Title 46 - Shipping
Each buoyant vest specified in this subpart is a: (a) Model AK–1, adult, kapok (for persons weighing more than 90 pounds); (b) Model AF–1, adult, fibrous glass (for persons weighing more than 90 pounds); (c) Model CKM–1, child medium, kapok (for children weighing from 50 to 90 pounds); (d) Model CFM–1, child medium, fibrous glass (for children weighing from 50 to 90 pounds); (e) Model CKS–1, child small, kapok (for children weighing less than 50 pounds); or (f) Model CFS–1, child small, fibrous glass (for children weighing less than 50 pounds). [CGD 72–163R, 38 FR 8119, Mar. 23, 1973]
Title 46: Shipping
PART 160—LIFESAVING EQUIPMENT
Subpart 160.047—Specification for a Buoyant Vest, Kapok or Fibrous Glass, Adult and Child
§ 160.047-2 Model.

