Yes, if you hold a light up to the pink dilators (touch the plastic with light) such as a flashlight or camera phone you can see the magnets. There are over 60 magnets in each Full Set of Magnetic Dilators (five sizes). The grey dilators are harder to see through. If you tap larger dilator on a table top or counter you will hear magnets tap against the plastic. We use an extremely light medical grade plastic and a lightweight sleeve to attach magnets to.