Our 25 ml Jar Sifter Inserts are intended to be used with 25 ml Polystyrene Sifter Jars. The Sifter Insert makes it easy to control the amount of powdered cosmetics that you apply to your brush. They are perfect for use with shadows, blushes, bronzers and foundations. Simply place your powdered cosmetic and the sifter into the corresponding 25 ml Polystyrene Sifter Jar.