Cooper B-Line Dura-Blok Rooftop Supports are made of 100% recycled rubber which qualifies for LEED credits. The supports have channel through-bolted on all size options for added strength and stability. On longer assemblies, a one inch gap between blocks allows water to flow freely around and away from the assembly. The support does not penetrate and has no sharp or abrasive edges, helping extend the life of the roof. When used in combination with Cooper B-Line Strut and Pipe Hanger Systems, Dura-Blok supports offer a total solution for rooftop applications such as solar PV mounting systems, piping, HVAC equipment, rooftop walkway systems, ducts, conduit and cable tray supports.