[Product]:This pack contains 32 pieces of Synthetic Filter Paper Stickers,each piece have strong adhesive [Material]:Made from quality PTFE (Polytetrafluoroethylene) film,these Synthetic Filter disc offer performance in terms of water resistance and air permeability [Size]:Each hydrophobic membrane has a diameter of 20mm,making it suitable for a wide range of applications [Packaging]:The package includes 1 sheet with 32 individual pieces attached.This ensures you have enough supply for multiple uses or replacements [Versatile Use]:These membranes are great for use in sensors that require waterproofing while maintaining breathability,applied under wide mouth jar lid for mushroom cultivation,as well as in applications that require oil repellency