This is a Photoflex Diffusion Fabric Kit for a Large (36x48") Lite, Multi or SilverDome. It includes a 1/2 and 1/4-stop fabric that installs easily with touch-fasteners in place of the original diffuser.
Photoflex Domes originally come with 1-stop front diffuser fabrics. A 1/2 or 1/4 stop fabric will cause less light loss, and less softening. Use these diffusers to provide more versatility while lighting subjects with your softbox.
These fabrics actually have visible grids, like graph paper, that do not affect the light passing through -- they aid identification at a glance.