The completed Class 2 Buoy ready for delivery to the care of Trinity House. The lower sections are filled with closed cellular foam to assist flotation. The 'wings' are interchangeable and shaped to suit the purpose, then of course, the colour is dependant entirely on the polymer powder loaded into the rotational moulding machine in the first place! The design, structural analysis and design verification was undertaken at Rota Design Limited by Martin and myself. [108] [273]