The Syringe Filter 0.22um Pore Size with a 4mm diameter is specifically designed for peptide filtration, providing a reliable solution for self-protection through filtering out impurities. Made from PES material, this filter is ideal for ensuring the purity and safety of peptides in various applications. With a small pore size of 0.22um, it effectively captures impurities and particles to maintain the quality of the filtered peptides.