"The plug" model is one of my favorite headphones with passive isolation. Sadly, after years of use, the cushions became less squishy and their hollow overstretched at the point that the cushions remain in my ears when I remove the headphones. Thanks koss sells replacements. They arrived quite fast, bringing to my headphones new life.

I like having the small for left ear and the big one for my right ear. It make the bass come through!

Hi ! This is Mr.Herman Woods here, I Have all ways been a fine of KOSS HEAD PHONE . I CAME INBTO THE STORE . ABOUT 9 YEARS AGO ! VISITING FAMILY ! IN MILWAUKEE ! I TALK TO THE LADE AT THE CONTER ! SHE WAS VERY NICE ! TO ME AND MY BROTHER ! WE HAD A NICE CONVERSATION .TO GETHER ! I HAVE BEEN USING KOSS ! UR-40 FOR OVER 10 YEARS. I THIMK THEY ARE THE BEST. I THINK NOBODY CAN TOUCH YOU GUYS ! HEAD PHONES. LOVE YOU GUYS ! IF YOU CAN STAY !!!!! IN BUSINESS ! FOR YEARS TO COME.THANK YOU FOR YOUR TIME ! MR.HERMAN WOODS ! HAVE A VERY NICE DAY . NEXT TIME IN AM DOWN THERE ! I WILL STOP IN .TO SAY ! HI .THANK YOU !

Great