The double dock pontoon cube is designed to interlock with other blocks and V-Blocks in the ‘Float my Boat’ range. This allows the creation of any size pontoon or boat dock you may require. Each double block measures 1m long, 0.5m wide and 0.4m deep. Each double float provides a massive 190kg of lift when fully submerged. Made from tough virgin HDPE plastic and once connected has a two-ton tear strength.