Medium-density wirebrush spheres are constructed of 5 pound per cubic foot density foam, coated with polyurethane elastomer in criss-cross pattern, and equipped with wirebrush straps. They are used for medium cleaning applications for buildup removal. WARNING: This type of sphere is designed for very aggressive heavy-duty cleaning applications. However, the sealing capabilities are not as good as standard spheres. The SPH-5W should be immediately following with a bare sphere or swab in order to help seal. If used alone, it will require substantial volumes in order to propel the sphere.
