• My inner part is filled with helium
• Rubber comprises my epithelium
• If you tie me 'bout your hand
• Then I'll stay closer to the ground
• Else I'll go up to the sky
• I am not a balloon, what am I?

My inner part is filled with helium
Rubber comprises my epithelium
If you tie me 'bout your hand
Then I'll stay closer to the ground
Else I'll go up to the sky
I am not a balloon, what am I?