The question was asked. Why we use the edges we use! I feel like the Bearing edges are the most important part of the drum. You can get a wide range of sounds from it. Bright, medium, to low. We love that vintage sound, so we add a 1/8 radius to the outside and 45 to the inside. It gives a warm vintage sound WITHOUT a bunch of over tones to mute out from the start. We found it makes it a whole lot easier for sound check and studio preparation. Wood plays a part too, but that’s another topic. The vintage drums sound because after years of playing the heads over time wear down the edges which losses its brightness plus the edges get worn down from excessive vibration over the years. We try to achieve this from the start.