Contain unicellular polyurethane foam. Features floating polypropylene grab lines with UV Stabilizers, secured inside the foam core. Molded-in becket design means there are no straps to wear, mildew or deteriorate. Choice of vinyl or hard shell polyethylene skin. All rings meet USCG Commercial approval. SOLAS approved models equipped with reflective tape. Min. buoyancy 16-1/2 lbs.