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Etymotic Research ER38-15SM 3-Flange Replacement Eartips - Small - 10 Pack - FrostPackage of 10 small frost 3-flange eartips. Ear canal opening 7-11mm. Designed for use with ER4 series, HF series, MC series, ETY Kids, HD5-Safety, etyBLU, etyBLU2, HD15-High Definition Electronic Earplugs, MusicPro, Gunsport Pro, EB-15 BlastPlug, and Home Hearing Tes..