What is this material made of?

His opinion is completely opposite to my position.

Antimatter is said to have the opposite properties of matter.

He may say he's a doctor, but he's actually a veterinarian.

It is said that antimatter has properties opposite to those of matter.

His nature is very kind, and he is liked by everyone.

I am opposed to his opinion.

He always carries an umbrella around.

He was holding my hand tightly.

He was running while holding a bag.