Package of 6 large yellow foam eartips. Ear canal opening 10-14mm. Designed for use with ER4 series, HF series, MC series, ERMK-5 Isolator, EtyKids, HD5 Safety, MusicPro, Gunsport Pro, HD15-High Definition Electronic Earplugs, EB-15 BlastPlug, etyBLU2, The BEAN, and Home Hearing Test.