Smart putty has been available for a long time as an amusement but this visco-elastic polymer has serious engineering applications.Soft stretchy and bendy when moved slowly solid when trying to move quickly or impacted.It has the remarkable property that it usually behaves as a soft mould-able plastic (like chewing gum) but instantly becomes a rubber if impacted and bounces like a ball. It can also float in a liquid and will form a puddle given enough time. It is a great demonstration of an unusual polymer a useful adhesive and can be used in many creative and fun activities.Supplied: 100g in a plastic container.