The flapper caps are a great choice for containing products that need to be dispensed in smaller doses. To dispense the product the flap is flipped up, the product is dispensed through the holes, and then the cap is re-sealed by simply pressing the flap back onto the beaded finish. This 43-485 black polypropylene (PP) plastic flip-top dispensing cap has a snap closure - along with 5 holes (.200 inch orifice) for controlled dispensing, crab claw sealing mechanism, and smooth outside round skirt. These snap-top caps are a great choice for dispensing dry food ingredients such as herbs and spices. This cap includes a pressure-sensitive foam liner PS113. The liner is designed to be used as an inner seal for dry products. Note: Pressure sensitive liners provide an extra level of protection in that it actually creates a seal that sticks to the rim of the bottle.