These are fantastically good value! Flexible plastic pushmoulds to use with polymer clay, air-dry clays, sugarpaste etc. Brush with a little cornflour or talcum powder and push well-kneaded clay into the mould to use. The mould sheet measures around 15 x 19 cm in total, to give you an idea of size.
This sheet has a variety of seashells and a rather miserable looking fish. I am sure you could cheer him up with some tweaking of the clay afterwards though!