This is fit for all kinds of vessels and aquatic equipment, used by the seamen and passengers for life saving. The Specification:Coverd Material: Hard PUBuoyancy Material: PolystyreneColour: OrangeOutside diameter:720mmInside Diameter: 430mmWeight:4.3KGSAccessories: Self activating smoke signalPolyethylene grab line is attached by four bands. 4.3Kgs Plastic Life Buoy