Features: 32pcs synthetic filter paper stickers 20mm membrane for mushroom cultivation wide mouth jar lids. Made of high quality EPTFE materials, high temperature resistant, non-toxic and durable to use. You will receive 1 sheets, totally 32pcs filter paper stickers, enough quantity to meet your different needs. Waterproof and anti-dust sticker can avoid some disadvantages, and allow for fresh air exchange. Widely apply for family plant, mushroom cultivation, also for wide mouth jar lids and more. Size (Diameter): 2cm/0.8 inch Material: ptfe film Main functions: 1: Effectively block water, salt and other corrosive liquids, and make sensitive parts of the equipment safely leak outdoors. 2: Air permeability can be quickly restored after contact with water, oil and other liquids. 3: The dense and uniform micropore distribution can effectively block dust while being waterproof and breathable. 4: Balance the preure, prevent the air and water around the sealing parts from entering the machine body, and protect the sealing integrity. 5: Protect the parts from the weather and withstand the immersion of water and other liquids. 6: Make the protected parts easy to clean, free from corrosive pollutants, and ensure the performance and service life of the parts. 7: UV resistant, with strong chemical inertia. 8: Thin and light, with good concealment, it brings convenience to design and production. Package includes:32pcs/sheet Synthetic Filter Paper Sticker Friendly Tips: The size is measured by hands, please allow minor error of measurement. Photo color might be a little different from the actual product due to color display of different monitors.