The SMB100 modular buoyancy is made from a rotomolded PE outer shell and filled with polyurethane (PUR) foam, with compressive strength for a variety of depth ratings. The continuous high quality chain is terminated at either end of the buoy by use of hot dip galvanized steel terminating discs that are designed to prevent damage to the buoy. The chain is easily attached by shackle to the anchor line. All wear parts are standard components and can easily be replaced. These modular buoys are designed for submerged and surface use and they can be equipped with four yellow, daylight reflective tapes for better visibility. for 4 depth max: 10mtr, 30 mtr,70 mtr and 500 mtr and 1,2,4, or 6 modules.