Mixing ball

Hello! Please remove if not allowed, I searched and couldn’t find this question asked before. I recently made a purchase from ILNP and I’m so excited to try one of them this weekend! I did notice that none of the polishes I got seem to have the little mixing ball in them. I usually get cheaper nail polishes so this is my first “big” purchase so I’m not sure if the better quality doesn’t need the little ball? Any advice would be greatly appreciated!