I saw a post awhile back about lead or slinkie for drift fishing. I prefer both, what I call a "shrinkie". I can't take credit for it I think I may have heard about it here on Ifish.
The shrinkie is 1/4" shrink tubing with .270" balls inside. After I've heated the shrink tubing up I squeeze the ends with pliers so it's sealed on both ends.
Here's a picture of one I made this morning
Here's a little closer look. You can see I drill a small hole in the end so I can clip it on a snap swivel. I use a sliding lead set-up.
I like the shrinkie the best for drift fishing. It get's down quick like lead and is pretty snag free like a slinkie.
What I really like about them is they have a distinct feel like lead where a fish has a softer tug, thus it's easier to tell the difference between the bottom and a fish.
I make them in all different sizes, but if you only make a few make them larger. You can cut them down on the river and they'll stay together.