I have this set gave my nephew 3rd birthday and he has struck on the hand drum only once. Not even very firmly. And now the coat was torn. The disappointment was great, of course! Otherwise the instruments are but class, gave him a lot of fun.
So the company Voggenreiter (of which I have actually heard good things on "Istrumentensektor") should improve either the drum, remove it from the set and exchange them for something else or make the set cheaper!