I have the disc weights for really deep trolling, like 250' plus offshore. You can bend the fin a little to make them track a little apart but I think they tend to do it anyway and then pull back even farther. They are spendy but I still like the lead 15# balls with a fin. I have trolled offshore with 12 pounders down to 280 with 12s. I slow way down and fish with bait then to make sure they hit it and swallow the bait to make a sure hook up. This is of course for summer big kings or Tyees. This year the big hogs were off of the Washington coast down 400-420 on the bottom. Those that had the 20 pound balls with 500 feet of DR cable or 15 pound with dacron in place of the DR cable got them. Those that didn't-didn't.