Size: Diameter: 356mm / 14", Simply measure the inner diameter of the lampshade to determine the diffuser size required(Please carefully confirm the Size of the lampshade before purchase).Advantages: Made of 0.11 inch (2.7 mm) thick DOUBLE SIDED double smooth white acrylic. this diffuser is thicker than other diffuser and can withstand the heat generated by the lamp. It has good light transmittance, durability, heat resistance, and long service life.Application: This diffuser can soften and diffuse the light of light bulbs, making it perfect for eliminating glare from CFL or LED bulbs, improving visual comfort, creating more comfortable, softer, and even lighting, protecting your eyes, and creating a pleasant and comfortable reading and working atmosphere for your living space.