This Accessory Kit has been developed for use with our Vibration Generator (B8H30701 - not included) and contains a multitude of items for the demonstration of standing waves (longitudinal transverse and 2D) and kinetic theory. The 3D kinetic theory model consists of a transparent tube and 20 coloured plastic balls to represent molecules of a gas or liquid.The kit contains:Coil SpringThick Rubber CordThin Rubber CordChladni Plate (Size:Piano Wire LoopSteel StripsTransparent Tube: 300mm x 70mm x 3mm20 Coloured Plastic BallsCable TiesRequires the Philip Harris Vibration Generator and a Power Signal Generator (B8G85793) for use which are both sold separately.The Vibration Generator (B8H30701) gives mechanical oscillations when fed by signals from a Power Signal Generator (B8G85793). The Vibration Generator can also be driven using a Bench Signal Generator (B8G85779) and Power Amplifier (B8R07696) in the absence of a Power Signal Generator.The frequency response encompasses the whole of the audio spectrum and beyond.