Falcon Eyes has a wide assortment softboxes, which can be mounted on various brands of studio flashes using a Speedring Adapter. This way you can save a considerable amount of money on the original softboxes of other brands. The inner size of the Speedring Adapter on the side of the (Broncolor) studio flash is 13.7 cm. The outer diameter is 15.4 cm. With this Speedring Adapter you can mount the inexpensive Falcon Eyes softboxes, conical snoots and reflectors on your Broncolor studio flash.