Nady EMI EB-4/3 Rubber Earmount Inserts Medium EMI EB-4/3 Rubber Earmount Inserts Medium The Nady EMI EB-4/EB-3 Rubber Earmount Inserts are made of soft rubber They are for use with Nady EB-4 or EB-3 earbuds, giving them more focused projection and superior external sound rejection The Nady EMI EB-4/EB-3 Rubber Earmount Inserts are made of soft rubber They are for use with Nady EB-4 or EB-3 earbuds, giving them more focused projection and superior external sound rejection