Perfect size: Each filter pad is approximately 2.95 inches in diameter and the adhesive is approximately 0.2 inches wide, suitable for covering monotub air holes 2.5 inches and under. They can perfectly protect the mushroom grower's vent. Efficiency filtration: Monotub adhesive filter disks are ideal for demanding applications as they both air circulation and filter out tiny objects, providing a healthy and safe mushroom cultivation process. Easy to install: Simply peel the backing paper off the monotub filters and stick the filters over the holes in the monotube filter. They are simple to use and remove, saving you time and effort. Excellent performance: monotub filter discs are moderately dense to air exchange, providing a clean, controlled environment for your mushroom cultivation and plant cloning needs while maintaining high humidity levels. Disc filter set: You receive 24pieces of 2mm thick Mushroom Box Filter Pads for mushroom cultivation, mushroom monotub fruiting chamber, etc., in quantities sufficient for your daily use and replacement., Weight: 0.14109584768 Pounds, Manufacturer: Feyoalix