Biostrike™ Strike Indicator is a reusable, biodegradable, strike indicator putty. Biostrike floats high and will not become waterlogged after many uses. Biostrike putty adheres strongly to the leader, hardens in cool water and will not come off during vigorous false casting. Colors: Blaze Orange, Saturn Yellow.
I find this puddy floats high, stays well attached, and can be moved along the leader fairly easily. The downside, I find, is a sticky residue left on the leader where the puddy was formerly positioned. This can be removed with rag and warm water, but I don't carry those things on the river. Also, if you happen to real your leader through your guides the residue can end up on the guides.
Long time user of this product. It works well, and is environmentally friendly, my goto strike indicator. Only complaint is in warmer weather, it often gets soft, and it might fall off the leader.