Screened Bottom Boards not only increase ventilation in your hive but also assist in monitoring varroa levels. When monitoring for Varroa Mites insert the plastic tray and after 24 hours remove and count the number of mites on the tray to help determine if mite treatments are needed. This Screen Bottom Board can be used in place of a Solid Bottom Board. It includes a flat plastic tray to close up the hive or to monitor mite drops. Available in both 8 and 10 frame sizes. We recommend painting the surfaces exposed to the weather with an exterior grade latex paint. Our "Original" style hive stand is designed to be used with this screened bottom board. Fully assembled. Comes with wooden entrance reducer.