I actually have a 4 and a 6 set of tongues. I took the sixes out, and went to fours last year and loved them. they were really forgiving for the park riding, and midwest conditions i was dealing with. I'm going to use the 6 pair this year because i'm in montana, but when it comes time for bc booter skiing, the 4s are coming back out. the 4 was easily enough to control my skis in gnarly terrain, but the 6's do make a big difference.