튜브가 · 튜브를
swim ring, inner tube
Example
아이가 튜브를 타고 바다에서 놀았어요.
The child played in the sea on a swim ring.
Word parts
From English 'tube'. Konglish: in Korea it usually means an inflatable swim ring.
Good to know
Floating on one is 튜브를 타다, literally 'to ride a tube'.