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. Excellent performance: monotub filter discs are moderately dense to fresh air exchange, providing a clean, controlled environment for your mushroom cultivation and plant cloning needs while maintaining high humidity levels. 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. 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. 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. Color:White Material:Cotton Thickness: 2mm Package Contents: 24 * 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.