The Cool Lights CL-SCR0300 scrim set is 127mm (5") in diameter and will work with any fixture with an accessory holder in that size range including the Cool Lights 300w tungsten fresnel, Cool Lights CDM 70w fresnel, Arri 300w compact tungsten fresnel and compatibles. The set includes a convenient nylon carrying pouch, full single and half single scrims (standard green color code) and full double and half double scrims (standard red color code). Scrim material is stainless steel and protection edge ring is anodized aluminum.