"The Rocker Stoppers help you reduce the effects caused by the waves and contrails of other boats when anchored. The Rocker Stoppers are stacked together and form are compact, and each one has a diameter of 33 cm (14 ") and 450 g are very lightweight, made of impact resistant styrene, are virtually indestructible. Be Deployed and retrieved in few seconds. They are resistant to the effects of salt water and do not damage the hull of your boat. Mode of use: simply place each rocker stoppers approximately 44 cm (18 ") of distance, making a line with them, with approximately 4 – 5 kilos of weight placed at the end of the line. Hang each of these lines to each side of the boat. Only with four pieces by hand are sufficient for the majority of boats of 11 m. Be sure of how the hangs longer that will be always under the water. Use of braided nylon rope 10 mm (3/8) or 3 stranded brunches of nylon. Use without the weight (or with a lower weight) For Boats of fishing. The Rocker Stoppers Iran hundiendose gradually. They are also ideal for use at the end of spring, to stabilize the end of this of the swinging. Number of rocker stopper that you need to each side of your boat: 0 – 8 m (26 feet) – 3 8 – 11 M (27 to 36 feet) – 4 11 – 13 M (37 to 42 feet) – 5 13 – 15 m (43 to 50 feet) – 8