The Pro Series Aluminum Glow Ring is for use with our Pro Series Aluminum Super Scope Housing (040-3). Pin sizes available are .010, .020 or .030 . Select from blue, green, or red fiber. Specialty Archery uses high quality Super Flex fluorescent fiber for brilliance. Take into consideration the pin size when ordering, if you use a clarifier. Clarifiers clear up the target, but can fuzz up your pin. When using a clarifier we recommend using a larger pin size.