I don't like these for a lot of reasons. (1) They get twisted and mess with the drift. (2) You can't put them on in a way that stays on later in the set. (3) Moving them further up the line can fray the leader. (4) If you lose them, they will be on the water forever. For a few more pennies, I'd upgrade to the air lock personally.

There's nothing worse than finding these goofy little plastic bobbers on a river bank, which happens all the time. I suggest the alternative to non-biodegradable bobbers to a large stimulator, or salmonfly pattern. Also, a bobber makes you look like you've given up. Throw some streamers man!!!