Efficient filtration: Monotub adhesive filter disks are designed for demanding applications, allowing air circulation while filtering out contaminants to support a healthy mushroom cultivation process. Excellent performance: These filter discs provide moderate density for fresh air exchange, maintaining a clean and controlled environment for mushroom cultivation and plant cloning, while preserving high humidity levels. Perfect size: Each filter pad has a diameter of approximately 2.95 inches, with an adhesive border of about 0.2 inches, suitable for covering monotub air holes up to 2.5 inches in diameter. They effectively cover and protect ventilation points. Easy to install: Simply peel off the backing and apply the filter directly over the holes in the monotub. The filters are easy to use and replace, saving time and effort. Filter set: Includes 24 pieces of 2mm thick mushroom filter pads, ideal for use in mushroom fruiting chambers, monotubs, and similar applications. Sufficient quantity for regular use and replacement. Color: White Material: Cotton Thickness: 2mm Package Contents: 24 x Monotub Adhesive Filter Disks Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3cm.