Skinny Fusing Glass Supplies Bullseye Stringers COE 90 White Opal approximately 350 - .5 (1/2) mm Stringer: Beadmakers - good for dot work; Fusers - good for bolder lines. C.O.E.: 90. Density: Opal (non-transparent). Color: White Diameter: .5MM (approx.). Length: 17-1/2" (approx.). Package: approx. 350 stringers per clear plastic tube.