Answer:
I regularly change shape yet remain a sphere. I am always there but not often seen. What am I?
Ten men's strength, ten men's length. Ten men can't break me, yet a young boy walks off with me. What am I?
What word sounds the same even after you take away four of its five letters?
I can swim but never get wet. I can run but never get tired. I follow you everywhere but never say a word. What am I?
I have two body parts but am used to measure length. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.