The SK-DB400 by StudioKing is a diffusion bulb with a diameter of 40 cm. Thanks to the extra large diameter, the light in the SK-DB400 is distributed very evenly over the surroundings. You easily connect the SK-DB400 to the light source, thanks to the standard Linkstar/Bowens connection. This S-bayonet is not interchangeable. The SK-DB400 is made of plastic, making the diffusion bulb durable and able to take a beating. The adapter for connection to the flash protrudes approximately 6 cm from the diffusion sphere.