2.5KG life buoys are fit for all kinds of vessels and aquatic equipments, used by the seaman and passengers for life saving. The life buoys of more than 4.3KG are used to release the self-activated smoke signal, supplying life buoy for the rescues and research direction for the rescuers. It is fit for all kinds of vessels and aquatic equipments, used by the seamen and passengers for life saving. The life buoys of more than 4.0Kg are used to release the self-activated smoke signal, supplying life buoy for the rescues and research direction for the rescuers. In accordance with SOLAS 1974/1996, the international life-saving appliance code, and MSC. 81(70). Outside material: HDPE Inside material: Hard PU Drop height: 80m