Our nesting tubes are cut from the stems of naturally grown Phragmite reeds. The diamiter of each reed varies in size from approximately 5/16 inch to 7/16 inch. Each reed is hand selected to and cut to a length between 6″-6.5″. Adding variety to the length and size of nesting material will give mason bees variety to choose from. All bees are not the same size and we have found better propagation when we use a variety of tube sizes.