CowboyStudio Pro 20-Inch x 20-Inch Quick Setup Speedlite Softbox with Hot Shoe Mount for Nikon Canon Flash Light One 20" speedlite softbox, Two White diffuser, One Carrying case. NOTE: Flash, stand are not included. Size of the softbox is 20" x 20", 15" deep This softbox is made to "pop" up into shape to create a full sized square softbox in seconds. Back bracket screws on to create the mount for your speedlite flash. The enclosed opening for the flash into the softbox allows for a speedlite to set into the softbox, utilizing maximum efficiency for your speedlite.