Fusing Glass Supplies Bullseye BU0301 Pink Opal COE 90 Stringer: Thread of glass pulled from remelted Bullseye sheet glass. C.O.E.: 90. Density: Opal (non-transparent). Color: pink. Diameter: 0.7MM - 1.2MM (approx.). Length: 17-1/2" (approx.). Package: 100 - 150 stringers per clear plastic tube (1.5 Sq.Ft. surface area coverage).