Syringe Filter OD=25MM,0.22 Micron,Made From PTFE,25pcs/Bag. This kind of Syringe Filter are made by ourself,if you need the customized Syringe filter or the filter Membrane,feel free contact with US. Ps,the color of the Filter is Freedom,mybe different with the pictures,if you need the Special color,please leave the message.