These cubes are connected to construct a floating U-shaped dock to fit around your sailboat so you or kids can walk around your boat, fold your sails on it, go down ladder and walk across them into boat, and also protect boat from dock in case dock lines break. I had a bad fall, when I slipped stepping down from dock Sun.. These would have prevented that. The ones I saw were at New Buffalo MI. I saw 19 advertised on eBay but too far to drive to Long Island! They are quite expensive new. Thank you.