Etymotic Research ER38-14A Small Beige Foam Eartips Package of 8 eartips Ear canal opening 6-9mm Designed for use with ER4 series, HF series, MC series, ERMK-5 Isolator, ETY Kids, HD5-Safety, etyBLU, etyBLU2, HD15-High Definition Electronic Earplugs, MusicPro, Gunsport Pro, EB-15 BlastPlug, etyBLU2, etyBLU, The BEAN, and Home Hearing Test.