This is one of the best tools Park makes and is five stars out of five in my book. something not right about these. Okay great. but then once you get going it?s a snap. I should?ve looked closer at the picture though. I will not buy this product again. The next picture show my size 10. It may be better to buy another set of £30 headphones for normal music and just use the Audio Technicas for noisy environments. So if this is your first step away from membrane this will blow you away. The keys and the key cylinder can be purchased from Thule but at the typically ove-the-top Thule pricing