Thank you for viewing. This is a TS-type overdrive with adjustable Low and High controls. I am the original owner, having purchased it new. It has only been used for a few hours and is fully functional with no scratchiness. When integrating it into a pedalboard, I used the nuts on the back cover, so the nuts are not the original ones, but they are standard size 7/64 inch stainless steel hex nuts. One of the nuts is missing, but there are no issues with use. The original nuts are 7/64 inch, but I tried to install metric nuts, so there are some scratches in one place. - Model Name: BAD MONKEY - Type: Tube Overdrive - Color: Green - Controls: LEVEL, LOW, HIGH, GAIN - Input Terminals: 1/4 inch jack - Output Terminals: 1/4 inch jack #GaryMoore #TubeScreamer #Overdrive