Buoy used for signals and as ship's fender.
Available sizes:

Cod. 15017 - B30: 240 mm diam. / 320 mm hgt. / 8 Kg buoy.
Cod. 15018 - B50: 405 mm diam. / 570 mm hgt. / 46 Kg buoy.
Cod. 10919 - B60: 480 mm diam. / 640 mm hgt. / 72 Kg buoy.
Cod. 14681 - B75: 610 mm diam. / 790 mm hgt. / 118 Kg buoy.
Cod. 14683 - B100: 810 mm diam. / 1040 mm hgt. / 280 Kg buoy.

In red color.