Air Lock Biodegradable Strike Indicators The new biodegradable foam has more benefits beyond keeping our waterways cleaner. The new design out-performs the original plastic design in every way. * 30% Lighter: Easier, more efficient casting and delivery. * Suspends 25% more weight on the water. * Lighter overall weight lands softer on the water. * Sensitivity: Better strike detection. * Durability: No more leaks, dents, holes, cracks or pops! * Easier to see leader slot when attaching.