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The EA306 from Shure contains three pairs of triple flange sleeves designed for use with the E3c, E4c, E5c, E500, i3c, and i4c in-ear headphones. The comfortable silicone sleeves are washable and reusable. The triple flange sleeves form a tighter seal than Shure's flex sleeves, helping to block out more ambient noise. If desired, the tube or flange of the sleeve can be trimmed for greater comfort.