The smooth black polypropylene disc top closures are made with a slight indent in the plastic top, which is designed to have a light amount of pressure applied to it in order to expose the orifice where the product can be dispensed.
Applying light pressure to the open end of the cap will also easily close the cap. The black polypropylene disc top closures are a great choice for dispensing products such as auto shampoos and leather conditioners.