"I have a few custom devices I made myself," Mao replied, watching as Riku tossed the pebble in. Mao probably would have tossed something bigger into the wormhole himself, but a pebble would work too. If only they had more items of different materials. Then he could see what kind of effect--if any at all--they had on it. Maybe... "What kind of things do you have on you right now?"