9 1/8″ Green plastic drone frame. One piece plastic frame with large cell foundation. Use as part of your Integrated Pest Management program. Insert on frame into each hive. when the bees have capped the cells, place the frame in a plastic bag in the freezer overnight. Remove the frame from the freezer and let is come to room temperature. Using a capping scratcher break open the cells, and return it to the hive for the bees to clean out the dead drones and mites. Repeat the cycle.