Great Filtration: Monotub adhesive filter disks provide superior air exchange while effectively blocking contaminants, ensuring a healthy environment for mushroom cultivation Precision 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 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 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 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 Color: White Material: Cotton Package Contents: 48 * Monotub Adhesive Filter Disks Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.