Made of PVC, it consists of two chambers: the main chamber (the buoy itself) and a small additional chamber located at the bottom (which contributes to giving the buoy a more stable shape). The round marker buoy, Scorpena O, is brightly orange-colored and features a waterproof "diver underwater" flag mounted on top. At the bottom of the buoy, there is a semi-circle where the buoy rope with a weight is attached. The buoy has a diameter of 40 cm and a chamber height of 30 cm. With the flag, the buoy's total height is 60 cm