The new AirLock strike indicators are designed with biodegradable foam so those indicators that end up floating away for any reason will break down over time. Not to be confused with “water soluble:” Air-Lock Biodegradable Strike Indicators will not dissolve or be compromised in any way during normal use. Biodegrading happens when the material is left in the elements: mud, water, mulch, compost, etc. over a long period of time. The new biodegradable foam has more benefits beyond keeping our waterways cleaner. The new design out-performs the original plastic design in every way.