Description: 【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. Size Chart: 2cm/0.79inch Package Includes: 1 sheet with 32 pieces of Synthetic Filter Paper Stickers Note: Please allow slightly errors due to manual measurement and different monitors.