I a plastic molding of the base which is used to insert the diffusers that broke at the end of the second intensive use of this product. A fragile product, but given the price we do not choosy. So I fixed the diffuser to the support through a clip where the nozzle is removed. If it improves the light output in flash for close-up scenes. For bigger scenes product retains more light there than diffuse. If you're photographing your house of night with the diffuser this may make less with the flash of the case "naked". The delivery was a little long but since the product comes from China it is normal. To buy a product as a bun so.