The cover provided is sympathetic with intercropping, gels are effective, there has even a table showing the amount of light lost depending on the tone used. As against the rubber band to place around the flash head is a flexible tube. It has the advantage of well hold the sheet against the window but we must be careful to make the adjustment. I fear that missing a precaution, the tabs are quickly damaged or even torn. This is a good product compared to the amount invested and the use I will do.