Bought a set of Two Brothers Black Series Aluminum slip ons. Paid 475.00 I decided to call Two bros to see what was taking so long and was told that the Aluminum tubing was out of stock and wouldnt arrive for another week to a month. I called back yesterday and asked if they would upgrade me to the next step up. To my surprise, they said YES!!! They are sending me a pair of Carbon Fiber Slip ons at no extra charge. Cant Wait!