Beaker is nothing for children's hands a star deduction

My son is now 5 years, we use it only as currently top ranks with Yahtzee 3 couples etc, we leave out even with his friend the 6 years it has for too long and lose the kids the pleasure (my understands not quite there 3 couples etc)
the cup would be round or slightly smaller but it would no longer fit into the box ... with a little practice it works well with the cup
Personally for me the cup is very noisy days when shaken game only with good-humored play possible;)