The Elinchrom Rotalux speedring for Elinchrom Mount is designed specifically for Elinchrom flash heads and Elinchrom Rotalux softboxes. speedrings are paired with rod-based softboxes, octaboxes, and other light modifiers to be mounted on the front of your flash/strobe to soften and shape the light to taste. To use, simply line the rods of your Elinchrom Rotalux softbox (not included) to the color-coded, spring-locking sockets of this speedring like building a tent. Then, put the strobe and speedring together and lock down. The movable/spring-locking rod inserts allow you to point them forward for easier rod insertion and then are opened up and locked to make the softbox taut.