Good sturdy plastic, easy to clean, long-lasting.
Enjoyed from 6 months, although a 4 year old recently enjoyed it (I think as a novelty value as she hadn't played with it for a while).
Many ways to play with it; stacking, knocking down, banging cups together, putting small objects into the cups. Also planning on using it to teach colours.
Also fit together inside each other, so minimal storage space required.
A real classic, loads of playing opportunity for a low price and small amount of storage space needed.