器 instrument

KEEP the products in big boxes so they don't get damaged! They are delicate instruments! Especially violins!!

musical instrument ★★☆☆☆
楽 (enjoy) + 器 (instrument) = 楽器 (musical instrument)

arms ★★☆☆☆
兵 (soldier) + 器 (instrument) = 兵器 (arms)

arms: unlike the related term 武器(ぶき）, 兵器 generally means things that are very modern and big: bazookas, missiles, rocket launchers, howitzers.

dexterous ★☆☆☆☆
器 (instrument) + 用 (utilize) = 器用 (dexterous)

skillful, dexterous. Like a kung-fu fighter that can jump around and not get kicked, or a pianist who plays hella difficult pieces without any fucked notes. There is also an implication that the person can improvise!