Habitat Mooring Systems 4000LPS Solid Mooring Block. 4,305 lbs. 6' 4" square x 14" high. Low profile habitat moorings now offered in solid block! These moorings are manufactured in Maine and are poured with high density, fiber reinforced concrete rated at 5,000 psi. The Solid Mass version has same patented hitch rod system for easy chain attachment and maintenance. Plus, with this proven hitch system, there is no need for a shackle.