Royal Designs BS-749-18EG Shallow Drum Side Pleat Basic Lamp Shade, 17" x 18" x 11.5", Eggshell Shade Dimensions: 17 x 18 x 11.5 (Top x Bottom x Height) Shape: Shallow Drum / Side Pleat Fabric: Hand Tailored Silk-Type Shantung Fabric, Premium Off-White Softback Lining Washer: Standard (0.5 inch recess) brass-finish spider fitter w/ trademark stamping. This shade fits using lamps with 6 in, 8 in, 10 in glass reflector/diffuser bowls Frame: Heavy grade 1.5mm rust resistant metal frame. Thicker than typical standard lamp shades.