Answer: Mallets
Why? (Little confused by question but this is what I know about metal and bamboo instruments)
You have to play the with a mallet that is less dense and less hard than the material you play on like metal and bamboo
Hope this helps :D
I think the largest amount of total body water is found in the:
D. Intracellular Fluid
According to the Wikipedia, it is stated that 70% of body water is intracellular.
