Save time, cut inventory and reduce record-keeping. The two-piece, molded plastic cap operates as a standard palm-and-turn style closure with opening instructions clearly imprinted in green on the smooth top. Flip it over and it becomes a Non-Child Resistant threaded screw cap. Customers have the option of which closure to use. Vials are made of transparent, light-resistant amber or green polypropylene. Caps are included with vials in separate plastic bags.