Cuboss Speedcube Lube – Weight 4 is a heavy and viscous lubricant, it has a viscosity of 30K making it on the more viscous side of lubricants available here, it can be used in small amounts to slow cubes down when they are too fast, it also makes cubes smoother. Many speedcubes are already uncontrollably fast so need to be slowed down with heavy lubrication, this can be the perfect balance for cubes that are slightly too fast and need to be slowed down a small amount.