1.made of high quality glass and metal ring 2.Skylight Glass Filter 3.specialize in camera filter 4)Size:25mm-127mm Main Features:For OEM business, logo could be silk printed in white color on the metal ring. Size: 25mm, 27mm, 28.5m, 30mm, 30.5mm, 37mm, 43mm, 46mm, 49mm, 52mm, 55mm, 58mm, 62mm, 67mm, 72mm, 77mm, 82mm, 86mm, 95mm, 105mm, 112mm, 127mm.