Genuine Etymotic Gray 3-flanged eartips (5 Pairs) for the Etymotic ER-4, ER-6i, hf2, hf5 Earphones & Etymotic ety8, etyBLU, ETY-COM Headsets.
P/N: ER-XX-18 Are Interchangeable With Etymotic P/N: ER4-18, ER5-18, ER6I-18, ER22-18, ER23-18, ER88-18, ER89-18
Note: Eartips are NOT compatible with the ER6 (non "i") earphones.