ROUND UNICORN PLASTER CRAFT MOLD
Each of your plaster casts will have a diameter of approx. 8.5cm and they will be approx. 1.5cm deep.
Try making your own hangers for the back like this:
A: Twist some garden wire into this shape.
B: Sink into the back of your plaster before it sets!
...then tie your balloons to the loop!
This is a food grade transparent plastic mould and it can be used for chocolate or soap making instead.