Those are the ones I use and they are pre-slit, but you got me wondering what would happen with an unslit wad. Dangit I wonder if anyone here has tried the unslit type and the results they had. I don't think they chenged those to unslit but you never know. You could always cut them yourself. If you are going to use Hevi-shot they make a TPS in yellow that is made for Hevi-shot. I think I also seen a recent post on this by someone who was with Knight and had excellent results with Hevi-Shot.