RDX-ONC which stands for Research and Development explosive octanitrocubane is a polymer coated octanitrocubane. It’s a powered version of a plastic explosive coated in a special adhesive resin. ONC or octanitrocubane is said to be emperor of all explosives. RDX-ONC doesn’t from just a spark but if immense pressure is applied as well. Kaito Wanijima usually conceals it in rolling paper as a cigarette allowing him to lay it down discretely.