Use this supplement foam in your cricket pen water dish and never have to rescue a drowning cricket again! This cricket pen foam insert acts as a protective layer between the hydration your insects need and their tendency to get stuck. Just put the sponge in place and fill. No more dead crickets contaminating the water supply and no more having to pay for additional crickets. Keeping the cage clean and your wallet full is a breeze with Cricket Pen Replacement foam. Replace as foam inserts break down or become soiled.