TOP QUALITY SPEEDOMETER GEAR "O" RING AND METAL CLAD SEAL FOR THE SPEEDOMETER ADAPTER ON MUNCIE 4 SPEEDS. THE "O" RING SEALS THE OUTSIDE DIAMETER OF THE ADAPTER WHILE THE "METAL CLAD SEAL" SEALS THE SMALL DRIVEN GEAR INSIDE THE SPEEDOMETER ADAPTER OR AS MOST OF YOU CALL IT "BULLET" THIS SALE IS FOR 1 "O" RING AND 1 SEAL BUT WE HAVE A SALE WITH QUANTITIES AVAILABLE AS WELL.