I just need to know what they are used for please??

You can use them in the coin machine for a random item, sP, or stat boost c:

Oh wonderful! Thank you so so much! If you don't mind I have one more question.. Where is the coin machine? edit Oh wait nvm I didnt know you put the link! Thank you!!

No problem! For future reference if you need to find it again, it's in the Lower West Side of Centropolis :)

- Oh great! Thank you so much. I am very grateful for all the information! <3