The kit includes 8 individually coloured boats, mast and boom combination, 4 buoys and an embedded magnet for each boat and buoy. With magnets the boats and buoys can be attached to a whiteboard or other surface when demonstrating sailing tactics to opti sailors. Boat dimensions are 5 cm X 2,5 cm, buoys 2,5 x 1,2 cm. The boats arrive in a neat box where all the 8 boats with masts and 4 buoys can be stored. Opti Coach Kit comes in a colorful waterproof 3D printed box with a rubber strap.