Quick & Hassle-Free Application: Simply peel and stick these monotub filters for mushroom growing supplies filter pad replacements over vent holes-no tools or extra steps required for a secure, long-lasting hold Fit for Monotub Vents: Each 2mm thick mushroom box filter pad measures approximately 2.95 inches in diameter with a 0.2-inch adhesive border, making them perfectly sized for monotub holes 2.5 inches or smaller What You Get: With 48 high-quality thick monotub filter discs included, this monotub filter discs set ensures you always have ready for maintenance or multiple monotub setups Great Filtration: Monotub adhesive filter disks provide superior air exchange while effectively blocking contaminants, ensuring a healthy environment for mushroom cultivation Balanced Density for Optimal Growth: This thick mushroom growing supplies filter pad replacements maintain ideal humidity and airflow, creating the perfect conditions for mushroom fruiting without compromising filtration efficiency, Manufacturer: PokFhgur