I use torpedoes for trolling up off the bottom. If you will be fishing close to bottom (lakers) then you will want round balls. I wouldnt bother with much under 10 lbs unless you will be fishing very shallow. The blowback on the lighter weights when you get down 70-80 + ft is significant. Just got 2 15lbrs from troutman and they look great. Sent from my SM-G950U using Lake Ontario United mobile app