13" Round Diffuser Translucent frosted White (will Soften Light from Drum Lampshades and Pendants) - - Amazon.com
San Martin Design Lampshade Diffuser, Translucent Light Shade Diffuser Made of 1/16-inch Thick Polypropylene, Natural White Colour Lampshade Light Diffuser, Variety of Diameters Available (10.5) - - Amazon.com