Riester Replacement Non-Chill Ring for use with:
Riester Cardiophon Dual-Head Stethoscopes (RST-4131-01).
Riester Duplex-de-luxe Stainless Steel Stethoscopes (RST-4081-01).
Riester Duplex Aluminum Stethoscopes (RST-4001-01).
Riester Tristar Stethoscopes (RST-4091).
Riester Anestophon Flat Aluminum Stethoscopes (RST-4177-01).