Brush Eight's SD9 modifier. This is version 2. Versions 1 and 2 are said to use precious metal cans, so I think there aren't many of them available. Compared to the recent 4.0 and later versions, the bass is bigger and the treble is crisp. I really love Brusheight's SD9, and I've used versions 2, 4.0, and XX. It seems that the metal cans used in the XX are different, so I was thinking of keeping it because of its rarity, but I have too many SD9s, so I'm putting this up for sale. There are scratches from use, so please check the condition in the images. Everything in the photos is included. Thank you.