Hempstead Halide's DEVITALIZING DISCS' are impregnated with liquid PASITHENE™' a proprietary composition that produces a soporific-like, sedative-like effect in insects and spiders, reducing the panic response and resulting self-damage to specimens that often occurs with the use of solvents, such as ethyl acetate and acetone, for euthanasia in killing jars. The death of specimens exposed to PASITHENE™ occurs from the disruption of sodium channels rather than from suffocation, providing a humane means of euthanasia. Our DEVITALIZING DISCS™ come in sizes to fit most killing jars and euthanasia chambers: peel and stick. Each disk remains effective through treating multiple specimens. PASITHENE™' is non-toxic to humans, other mammals, birds, and fish. Use all appropriate safety measures when working with DEVITALIZING DISCS™. Refer to the relevant safety data sheet(s).