Filter Head:Multi-filter 1L (glass sand core) Product Features: 1、 sand core filter head material is all-glass, and the pore size of sand core filter head is 10μm. 2、 sand core filter head is made of high-quality glass material, which is smooth and transparent, without air bubbles and with uniform wall thickness. 3、 sand core filter head has Jinteng anti-counterfeiting mark, beware of shoddy.