They are a strong magnet not unlike a lot of other brands strong magnets. Way stronger than those blue ones you see at Petco or some place similar, they're also more expensive. There's nothing inherently special about them though other than they are strong. IMO their add ons are what's cool about them. One is a triangle shape wedge on a pad that is great for pulling off coraline algae but you have to be careful that you don't have too strong of a magnet otherwise you'll prematurely wear it out, the algae sock is great too, but I found out you can buy ScotchBright Dobie pads that basically is the same thing (if you take the sponge out from inside) WAY cheaper too