Efficient filtration: Monotub adhesive filter disks are designed for demanding applications, promoting air circulation while filtering out contaminants to support a healthy mushroom cultivation process. Excellent performance: These filter discs allow moderate fresh air exchange, maintaining a clean and controlled environment for mushroom cultivation and plant cloning, while preserving optimal humidity levels. Perfect size: Each filter pad has a diameter of approximately 2.95 inches, with an adhesive border of about 0.2 inches, making it suitable for covering monotub air holes up to 2.5 inches in diameter. Provides effective protection for mushroom grow box vents. Easy to install: Simply peel off the backing and apply the filter over the holes on the monotub. Designed for straightforward application and removal, 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 compared to the actual item. Measurement may vary by +/- 1-3cm.