Compatible with: GSI GSI39, GSI TympStar Pro, GSI GSI18, GSI Pello, GSI GSI 61, GSI AudioStar Pro, GSI Audera, GSI Audera Pro, MAICO MB11 Classic
4.0 mm red PVC tip on standard back stem. For infant size ear canals. For use with E-A-RTONE Insert Earphone.