The 'Hurricane Balls' consist of two ball bearings welded together - no easy task! If you spin the Hurricane Balls on a smooth surface, you can use the plastic pipe to blow at one side of the Hurricane Balls. Not only does this keeps them spinning, you can accelerate them up to incredible speeds. Speeds of 12,000 rpm have been recorded for the Hurricane Balls using a laboratory strobe light.Any smooth surface will work for spinning on, but the very best is a concave mirror, e.g. those round, magnifying bathroom mirrors. We do not supply the mirror, as these are fragile to post, and are readily available everywhere.Once the Hurricane Balls are spinning, you can then use the coloured LED torches to illuminate them, with different colours at different angles. In a darkened room, the effect is magical! grand-illusions.com