The Mason Bee Starter Cottage contains 20 nesting tubes for 20 female bees. In early spring, wild mason bees search for nest sites such as the Starter Cottage. Mason bees can also be bought and placed inside the Starter Cottage if you create a space by removing one or two of the tubes. In the fall, the bee cocoons are removed from the tubes for annual cleaning and storage. Replacement tubes are also available. The “A” size package is 8cm wide, 8cm tall, and 21cm long. Mason bee cocoons are sold separately.