The 1/4 Grid Silent Black takes the edge off a source at quarter-grid strength while the black side keeps unwanted bounce from creeping back into the frame — the pick when you're diffusing close quarters and can't afford the spill a white rag throws. Silent construction keeps it out of the sound report when air is moving. Sizes run from the 4'x4' slip-on up to the 20'x20', each sewn in the USA by LA Rag House.