Blue Stuff sticks are a new generation of thermo plastic molding material which can be reduced to mouldable conditions by inmmersion in hot water for 3 minutes.
It will allow you to create an instant mold of any piece you wanted by pressing the plastic material against the piece you want to have the mold made from. After that, make copies by using any kind of putty, polyester resins or even epoxy resins. Nothing will get stuck. REUSABLE plastic moulding for all levels. 
New improved formulation that will allow you to have better details since the plastic will remain more time in soft state.
This set contains 4 bars and it will last for ever.
Dimension of each bar: 5.8x1.5x0.7cm
Weight of each bar: 6 gr