15' LAMPSHADE DIFFUSER - Acrylic Translucent Disc designed to fit the bottom of your 16' or 17' wide lampshade. THICK, DURABLE ACRYLIC - Made of 3mm thick frosted white acrylic with a slip 1 cm center hole. 25% thicker than other diffusers. BETTER QUALITY LIGHT - Softly frosted matte on Both sides will eliminate light bulb glare from ugly CFL or LED Bulbs SOFTER LIGHT - Directs light downward for accent or for improved reading light. Soften the light and 'diffuse' the harsh glare from stylish drum shades. DUAL USE - Perfect for mounting on top your table or floor lamp shade or fits the top or bottom of most hanging drum style pendant Light fixtures.