I have fished with a slip bobber for years. If'n you are crappie fishin and are waiting for the cork to go under, your gonna miss lot of crappie. Crappie eyes are toward the top of their head, hence they feed upwards.

I try to use a slender slip cork and use just enuf weight to keep the cork vertical. When that crappie even breaths on that bait the bobber will usually tilt or go horizontal. SET THE HOOK & catch supper!

Now I also like a bobber that has multiple color bands like the thill balsa. Sometimes when that crappie takes the bait the bobber will just go down a 1/4 to 1/2inch and stay there. SET THE HOOK & catch lunch! The different color bands help you to see this slight dip of the bobber.