My Mayflower MK3 Mod Kit came in and it does its job beautifully. The Mod Kit comes with - Black Newplast clay - Soft and stiff felt (two small cut outs each) - Dampening Foam (two small cut outs) - Pair of multilayered cotton - A sheet of paper with real to size cut outs of each item. ** Also ordered the Baffle Upgrade** (which I assume are what have tamed the highs for me) Installation took me about an hour and 20 minutes but it was my first time. I can easily cut that down to 40 minutes if I had to redo it again. The most time-consuming steps are cutting out the felt that fit into each crevice of the cup. It was well worth the $30 investment. I loved the headphones ever since first listening to the but the highs were on the edge of unbearable. Now It's brought them down a bit but nowhere near as harsh or fatiguing. Here are some pics I snapped of some steps in the installation: The upgraded baffle (last pic) is stiffer than the stock one so the sound is a little more focused when coming out of the planar drivers. I assume it is the major key in taming the highs seeing as the air vent(s) behind the baffle are obstructed even more so with a denser piece. Either way, the sound signature itself drastically changed. Great upgrade for those who are treble sensitive .