know good magnetic place?

[Sachmho]

Hey, I need a very durable magnet (well around 6 of em) , one that will hold up when hit with a hard force (looking into the gauss rifle, but on a larger scale) if you know of a good place online that has something like this, possibly in very short cylindar form (ie. 3/4 in. diam, 1/4 in. deep) please link me up. thanks