Great Filtration: Monotub adhesive filter disks provide superior air exchange while effectively blocking contaminants, ensuring a healthy environment for mushroom cultivationPrecision 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 smallerQuick & 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 holdWhat You Get: With 48 thick monotub filter discs included, this monotub filter discs set ensures you always have ready for maintenance or multiple monotub setupsBalanced 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 efficiencyColor: WhiteMaterial: CottonPackage Contents:48 * Monotub Adhesive Filter DisksOnly 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.