I actually made my own using moldable silicone. It is the same stuff hunters use for making custom ear plugs. All you have to do is mix the 2 part silicone up and fit it in your ear. Then you press the headphone drivers in. You have to be careful getting the driver aligned properly. once it is cured you pull the drivers out then stick a toothpick down the hole the driver left and use a dremel tool to open up the hole so it is open to your ear. They isolate perfectly but I still cannot get past the feeling of having my fingers in my ears.....if I only had to use my guitar and not sing I would use them. They sound great as headphones.