Kill cones are just a piece of material that float on the bridal and kill the pilot chute once your parachute opens on a canopy with a retract bridal system, which is how the Lightnings are configured.  Like CRW toggles, these are mainly made by fellow CRW dogs. We make kill cones as well.  There are different styles of kill cones made with different materials.  We can make kill cones or put you in touch with someone who makes them as well. Contact us for more.