The linkstar rs-40180lsr striplight softbox is 40 x 180 cm in size ans is easy to assemble. the rs-40180lsr is mounted on your studio flash unit with the included speed ring. the studio flash head sits deep in the softbox, which ensures minimal loss of light and provides an even spread of soft lighting. The rs-40180lsr is complete with a standard linkstar speed ring, which is compatible with bowens, studioking, lastolite, jinbei, qihe, and aurora studio flash units. by using an additional speed ring adapter, the rs-40180lsr is also compatible with falcon eyes, broncolor, elichrom, hensel and multiblitz studio flash units. to view these speed ring adapter rings, please see the optional accessories tab below. These softboxes are not suitable for halogen lamps, (such as the linkstar lq-1000), due to the high heat generation of these lamps. the soft boxes from the lqa series are suitable for such types of lamps.